Onan stops when letting go of start button, again

[ChadMan]

What's the number on the board Doomaz?
300-???? You can always give us a call ;&)

ChadMan
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Chad for Dinosaur Electronics
See our website at:
http://DinosaurElectronics.com
For tech help call us at:
[phone] 8-5 M-F PST
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
---

<<..>>

Unfortunately, a Flight Systems email today told me that they do not
manufacture a board for my Emerald I 4kw Onan.

You might also check Dinosaur- they have Onan boards.

I'll do that. thanks.

[Doomaz]

For others:

I found another place that sells Onan replacement boards (among others) too:

www.partsfortechs.com

Their price for the board I probably will need is just a little higher than
Flightsystems.

[Mickey]

Unfortunately, a Flight Systems email today told me that they do not
manufacture a board for my Emerald I 4kw Onan.

Is that the v-reg or the control board? I also have an Emerald I and they
did offer a new v-reg. For the control board the Onan one is repairable
and FLight Systems does rebuild or at least they did last yr.

Mickey

[Doomaz]

Post by Mickey

Unfortunately, a Flight Systems email today told me that they do not
manufacture a board for my Emerald I 4kw Onan.

Is that the v-reg or the control board? I also have an Emerald I and they
did offer a new v-reg. For the control board the Onan one is repairable
and FLight Systems does rebuild or at least they did last yr.

It is the voltage regulator board. I wish it had been the control board as
anything on there is an easy fix.

My parts manual lists 305-0782-01 as the part number. Flight systems says
they do not have a replacement for that board.

I'm now told that 305-0809-01 is the new part number and looking at Flight
Systems' web page, they do have a replacement.
But since I did give Flight Systems my Onan model number and they couldn't
figure out that they actual do have the replacement, plus they must not know
how to cross-reference part numbers, I'll likely not be ordering from them.

If I do find I need the board, I'll probably be buying it from
partsfortechs.com.

Right now I'm in the process of cleaning the area of the brushes but it
started to rain so I didn't get any farther.

[Lon VanOstran]

I'd still replace the fuel filter as a matter of course after running out

of fuel.
I'd be using a lot of filters. It runs out of fuel almost every tank. That's
when I know it's time to get gas.

Excuse me for being blunt, but you deserve problems if you are that ignorant.
Never let a modern internal combustion engine run out of fuel, unless you do so
by shutting off the fuel pump.

Lon

[Tom Marik]

<< Excuse me for being blunt, >>

Hey, Lon! Where have you been?

Tom

[Lon VanOstran]

Post by Tom Marik
<< Excuse me for being blunt, >>
Hey, Lon! Where have you been?
Tom

We are in Northern Michigan. Gaylord at the moment, and have been out of cell
phone service. In downtown Gaylord there is a coffee shop with several Internet
connections at cable speed. As of Sunday, we are going farther North into the
UP, and will likely be missing until almost Labor Day.

Lon

[m***@juno.com]

Post by Lon VanOstran

I'd still replace the fuel filter as a matter of course after running out

of fuel.
I'd be using a lot of filters. It runs out of fuel almost every tank. That's
when I know it's time to get gas.

Excuse me for being blunt, but you deserve problems if you are that ignorant.
Never let a modern internal combustion engine run out of fuel, unless you do so
by shutting off the fuel pump.
Lon

the dip tube for gen fuel only fall 75% to bottom of tank so you cannot run tank dry on gen! no chanch of picking up dirt! you are the ignorant one! a;so maybe retarded!

[George Anthony]

Post by m***@juno.com

Post by Lon VanOstran

I'd still replace the fuel filter as a matter of course after running out

of fuel.
I'd be using a lot of filters. It runs out of fuel almost every tank. That's
when I know it's time to get gas.

Excuse me for being blunt, but you deserve problems if you are that ignorant.
Never let a modern internal combustion engine run out of fuel, unless you do so
by shutting off the fuel pump.
Lon

the dip tube for gen fuel only fall 75% to bottom of tank so you cannot run tank dry on gen! no chanch of picking up dirt! you are the ignorant one! a;so maybe retarded!

...

Sounds like you’re the retarded one, he is talking about running the pump dry not the tank

[Vito M]

Good morning,
I pulled my coach out of storage this spring and my onan is suffering from the dreaded "only runs with the start switch depressed." The unit is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I have voltage to brushes while cranking, 25ohms between brushes. It did not appear to be producing VAC while cranking (but I may have had the breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking for some guidance as to what steps to take next.
Thank you in advance!

[Technobarbarian]

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering
from the dreaded "only runs with the start switch depressed." The unit
is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I
have voltage to brushes while cranking, 25ohms between brushes. It did
not appear to be producing VAC while cranking (but I may have had the
breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking
for some guidance as to what steps to take next.
Thank you in advance!

...

Our "wealth of knowledge" has mostly left this group since that
discussion in 2002.

TB

[Vito M]

Post by Technobarbarian

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering
from the dreaded "only runs with the start switch depressed." The unit
is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I
have voltage to brushes while cranking, 25ohms between brushes. It did
not appear to be producing VAC while cranking (but I may have had the
breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking
for some guidance as to what steps to take next.
Thank you in advance!

Our "wealth of knowledge" has mostly left this group since that
discussion in 2002.
TB

...

It was a long shot but I was hoping someone may still get notified of a new message in the thread

[Hank]

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering from the dreaded "only runs with the start switch depressed." The unit is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I have voltage to brushes while cranking, 25ohms between brushes. It did not appear to be producing VAC while cranking (but I may have had the breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking for some guidance as to what steps to take next.
Thank you in advance!

...

Not sure putting the Low oil to ground will help. Maybe check your oil level and disconnect it? Do you only have one start switch inside, or another outside? Do they both act the same?

[Jerry Osage]

Post by Hank

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering from the dreaded "only runs with the start switch depressed." The unit is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I have voltage to brushes while cranking, 25ohms between brushes. It did not appear to be producing VAC while cranking (but I may have had the breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking for some guidance as to what steps to take next.
Thank you in advance!

Not sure putting the Low oil to ground will help. Maybe check your oil level and disconnect it? Do you only have one start switch inside, or another outside? Do they both act the same?

...

True. If I remember correctly some of the oil switches are No Pressure =
grounded - and - some are No Pressure = open.

[Vito M]

Post by Hank

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering from the dreaded "only runs with the start switch depressed." The unit is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I have voltage to brushes while cranking, 25ohms between brushes. It did not appear to be producing VAC while cranking (but I may have had the breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking for some guidance as to what steps to take next.
Thank you in advance!

Not sure putting the Low oil to ground will help. Maybe check your oil level and disconnect it? Do you only have one start switch inside, or another outside? Do they both act the same?

True. If I remember correctly some of the oil switches are No Pressure =
grounded - and - some are No Pressure = open.
--
Jerry O.

...

Thank you for the info. It's been raining all week so I haven't been able to look at it any further. Ill dive back into it tomorrow and update the thread with any additional findings.

[Jerry Osage]

Post by Vito M
Good morning,
I pulled my coach out of storage this spring and my onan is suffering from the dreaded "only runs with the start switch depressed." The unit is a 6.5NHEFA11579P S/N:E000099421.
I have checked oil and bypassed oil switch by connecting to ground, I have voltage to brushes while cranking, 25ohms between brushes. It did not appear to be producing VAC while cranking (but I may have had the breaker turned off now that I'm thinking about it.)
I've noticed the wealth of knowledge in this conversation and am asking for some guidance as to what steps to take next.
Thank you in advance!

...

Here is a little tidbit that I have squirreled away from years ago when I
had the same problem. I have no idea where I got this guide, however it is
at least 15 years old. I don't remember my model # but it was an Emerald
6.5. It had a defective regulator.

You may have already tried this - but it is all I have.
~~~
The most common complaint is that the engine starts but will not keep
running when the START switch is released. This happens because the control
board will not allow the engine to continue running if the generator is not
producing voltage or if the oil pressure signal is not present.

See CONDITIONS REQUIRED TO KEEP RUNNING on the Troubleshooting Chart for
your model. If the engine will not keep running, do the following:

A1. Generator AC Output Check the generator AC output voltage as soon as
the engine starts. Models showing "B1-B2 Volts" or "L1 AC Volts" under
CONDITIONS REQUIRED TO KEEP RUNNING need this AC voltage to keep running.
Read between the points shown on the Troubleshooting Chart. If the AC
voltage readings are good, proceed to "B" below.

A2. Field Flash If there is no AC, check for 10-12 VDC at the FIELD FLASH
pin of the control board during cranking. If the field flash voltage is not
present, the control board is defective.

If the field flash voltage is present, the wiring or regulator may be
defective. To eliminate the wiring, check continuity between the FIELD FLASH
pin of the control board and pin 7 of the regulator. If the continuity is
good, either the regulator or the field circuit (rotor and brushes) may be
the problem.

A3 Field Circuit Check the field circuit by unplugging the regulator and
measuring the resistance between pins 9 and 10 of the regulator's mating
plug. This reading should be 22 to 28 ohms. If this reading is too high,
check the brushes and/or clean the slip rings (use the Slick Stick, or a
similar tool).

If this reading is too low, there may be a short in the rotor. Also, check
the resistance from pins 9 and 10 to ground. This reading should be very
high or infinity. If not, there is likely a ground in the rotor. If these
readings are all good, the regulator is likely defective.

A4 External Excitation To confirm that the regulator is defective, turn off
the generator's AC circuit breaker(s), reconnect the regulator and apply 12
volts through a diode to pin 9 of the regulator plug while attempting to
start the engine. CAUTION: DO NOT attempt this without the diode. If you
do, there will be fireworks! Remove the 12 volts within 1-2 seconds after
the engine starts.

If the genset now continues to run and produces normal AC voltage, the
generator is OK and the regulator is defective.

If the genset does not continue to run but produces about 40% of normal AC
voltage, again the generator is OK and the regulator is defective.

If no AC voltage is produced re-check all wiring for security and signs of
damage. If everything seems OK it may be necessary to take the unit to a
qualified repair shop.

B. Check the oil pressure switch as soon as the engine starts. If the
voltage on the LOL/LOP SW pin of the control does not go to near zero, the
switch is not closing.

These switches sometimes stick open if the generator has not been used or
exercised often enough. Multiple start/stop cycles and/or tapping on the oil
pressure switch will sometimes fix it. It may be necessary to temporarily
jumper the switch to ground to keep the engine running. This can be done at
the switch or at the OIL LOL/LOP SW pin on the control board.

Models showing "LOP Open" under CONDITIONS REQUIRED TO KEEP RUNNING
have electronic governors and require the low oil pressure switch to be
closed at starting but open during running. When the switch opens, the
governor module places a ground on the oil pressure input of the control
board (P1-5). It is OK to temporarily ground P1-5 on this model to keep the
engine running. NOTE: See chart for oil pressure and oil level switch
locations.

C. If there is AC voltage present on B1-B2 or L1 AC, as applicable, and the
correct oil pressure/level signal is present at the OIL LOL/LOP SW input of
the control board, and the engine will not keep running, the control board
is defective.

~~~
I hope this helps.

[Doomaz]

OK. The resolve for this was that it was a Voltage regulator board. I bought
a repairable one (The Onan replacement is non-repairable) from
www.partsfortechs.com and now all is well. I've been told by 3 different
sources that tarnished slip rings is the most likely cause for voltage
regulator board failure so I pulled the brush block and cleaned the slip
rings with a special stone made just for that purpose. Thanks to Alan
Robinson (who posts here) for the troubleshooting help.

I've seen this discussed but never heard any real resolve for it.
Onan 4kw Emerald 1.
Running fine. It stopped because of low fuel. I stopped about 5 mins.

later

and filled the tank (gas) and started it. It did as it always does; it
started and ran for 5 secs. then stopped. Normally I have to hold the

start

in for up to 45 secs. and then off it goes, once it gets the fresh gas.

This

time it sputtered a couple of times, and then died. From then on it will

run

with the Start switch held in, but as soon as I let up it dies. It is
putting out some voltage as the fridge switches over to AC but the Air
Conditioner does not come on.
Is this a regulator board? I tried shorting the oil pressure input to

ground

as it had oil, but nothing there.

[Mickey]

Post by Doomaz
OK. The resolve for this was that it was a Voltage regulator board. I bought
a repairable one (The Onan replacement is non-repairable) from
www.partsfortechs.com and now all is well. I've been told by 3 different
sources that tarnished slip rings is the most likely cause for voltage
regulator board failure so I pulled the brush block and cleaned the slip
rings with a special stone made just for that purpose. Thanks to Alan
Robinson (who posts here) for the troubleshooting help.

Took a look at the pic @ partsfortechs site and it looks like the V-reg
from Flight Systems I told you about several weeks ago. Mind saying what
the cost was?

Mickey

[Doomaz]

Post by Mickey

Post by Doomaz
OK. The resolve for this was that it was a Voltage regulator board. I bought
a repairable one (The Onan replacement is non-repairable) from
www.partsfortechs.com and now all is well. I've been told by 3 different
sources that tarnished slip rings is the most likely cause for voltage
regulator board failure so I pulled the brush block and cleaned the slip
rings with a special stone made just for that purpose. Thanks to Alan
Robinson (who posts here) for the troubleshooting help.

from Flight Systems I told you about several weeks ago. Mind saying what
the cost was?

...

I believe it was $193 and I paid $6 or $8 for UPS shipping to make sure I
got it the same week. I think Flightsystems was $190 but as I said before,
they weren't willing to help me out by cross-referencing my old part number
so I figured they really were not interested in my business.

[k***@gmail.com]

My generator stops when I let go of the on switch what could the problem be

[nothermark]

Post by k***@gmail.com
My generator stops when I let go of the on switch what could the problem be

You let go of the button?

Google is your friend. Manuals are on line.

[Hank]

Post by k***@gmail.com
My generator stops when I let go of the on switch what could the problem be

Need more specific info. Do you mean the "start" switch?

Hank

[p***@gmail.com]

Post by Hank

Post by k***@gmail.com
My generator stops when I let go of the on switch what could the problem be

Need more specific info. Do you mean the "start" switch?
Hank

Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

[Hank]

Post by p***@gmail.com

Post by Hank

Post by k***@gmail.com
My generator stops when I let go of the on switch what could the problem be

Need more specific info. Do you mean the "start" switch?
Hank

Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

...

I have to ask... What did the technician say?

Be advised I am not a generator repair person.

The first thing I would look at is the fuel shut off valve at the carb. If there is not power going to it, it will shut the fuel off. It is usually attached to the carb bowl. Your model may be different, or not even have one. The purpose of this valve is to shut fuel off instantly and it also keeps the engine from backfiring.

The next thing would be a safety switch is ground out.

Hope this helps.

Hank

[Frank Howell]

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.

[Hank]

Post by Frank Howell

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.
--
Frank Howell

I did not know that. Are you talking about Generator output voltage?

Hank

[Frank Howell]

Post by Hank

Post by Frank Howell

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.
--
Frank Howell

I did not know that. Are you talking about Generator output voltage?
Hank

yes

[Commie Hunter]

Post by Hank

Post by Frank Howell

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.
--
Frank Howell

I did not know that. Are you talking about Generator output voltage?
Hank

Most small engines have low oil shut off, even the lowly lawnmower engine.

[George Anthony]

Post by Commie Hunter

Post by Hank

Post by Frank Howell

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.
--
Frank Howell

I did not know that. Are you talking about Generator output voltage?
Hank

Most small engines have low oil shut off, even the lowly lawnmower engine.

You should put your brain in gear before you start your mouth moving.
The only low oil shut off "lowly" lawnmower engines have is when they
freeze up from lack of lubrication. I think I will bestow the title of
twins on you since the originals have tucked tail and run to their safe
space. You shall now be know as The Little Bobbie Twins.

[Commie Hunter]

Post by George Anthony

Post by Commie Hunter

Post by Hank

Post by Frank Howell

Post by p***@gmail.com
Onan 4000 Microquite

Low oil and incorrect voltage will also stop generator.
--
Frank Howell

I did not know that. Are you talking about Generator output voltage?
Hank

Most small engines have low oil shut off, even the lowly lawnmower engine.

You should put your brain in gear before you start your mouth moving.
The only low oil shut off "lowly" lawnmower engines have is when they
freeze up from lack of lubrication. I think I will bestow the title of
twins on you since the originals have tucked tail and run to their safe
space. You shall now be know as The Little Bobbie Twins.
--
"While we recognize that the subject did not actually steal any horses,
he is obviously guilty of trying to resist being hanged for it."

...

Fido the red with no wits at all and proclaims to be expert shade tree mechanic, gushes with his unlimited mechanical knowledge just so he can demonstrate his lack of knowledge and again make fool of himself. What a twerp.

https://www.jackssmallengines.com/Products/Low-Oil-Switch

[Jerry Osage]

Post by p***@gmail.com
Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

OK, I've read Hank's response and I have the same question. What did the
tech say? Since you're asking here I assume your "Tech" was unable to
diagnose, and fix, the problem.

Do you have a wiring diagram? Can either you - or the tech read it? If so,
what does those pins 9,10,11, and 12 go to? What do they do? How was the
meter set? What was the tech testing for on those pins?

Does it have low oil? The low on oil sensor is by-passed when starting but
low oil or a bad sensor will stop the generator when the Start button is
released.

I'm trying not to be too snarky here, however, without more detailed
information I suggest that you take it to a Cummins/Onan repair center and
have it fixed. Or - buy the meter from the tech and leave it hooked up to
the pins.

[Hank]

Post by Jerry Osage

Post by p***@gmail.com
Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

OK, I've read Hank's response and I have the same question. What did the
tech say? Since you're asking here I assume your "Tech" was unable to
diagnose, and fix, the problem.
Do you have a wiring diagram? Can either you - or the tech read it? If so,
what does those pins 9,10,11, and 12 go to? What do they do? How was the
meter set? What was the tech testing for on those pins?
Does it have low oil? The low on oil sensor is by-passed when starting but
low oil or a bad sensor will stop the generator when the Start button is
released.
I'm trying not to be too snarky here, however, without more detailed
information I suggest that you take it to a Cummins/Onan repair center and
have it fixed. Or - buy the meter from the tech and leave it hooked up to
the pins.
--
Jerry O.

...

Good point! I forgot about the low oil sensor.

Hank

[Jerry Osage]

Post by Hank

Post by Jerry Osage

Post by p***@gmail.com
Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

OK, I've read Hank's response and I have the same question. What did the
tech say? Since you're asking here I assume your "Tech" was unable to
diagnose, and fix, the problem.
Do you have a wiring diagram? Can either you - or the tech read it? If so,
what does those pins 9,10,11, and 12 go to? What do they do? How was the
meter set? What was the tech testing for on those pins?
Does it have low oil? The low on oil sensor is by-passed when starting but
low oil or a bad sensor will stop the generator when the Start button is
released.
I'm trying not to be too snarky here, however, without more detailed
information I suggest that you take it to a Cummins/Onan repair center and
have it fixed. Or - buy the meter from the tech and leave it hooked up to
the pins.
--
Jerry O.

Good point! I forgot about the low oil sensor.
Hank

...

Notice that PE Jarrett hasn't responded. That doesn't surprise me. He most
likely did a Google search and your post popped up. He hasn't responded to
your post and probably won't. He probably won't even see it because he has
no idea how he found it in the first place.

I have always been short with people like this.

It never ceases to amaze me that people who can not define their problem
with any clarity, or depth, expects a Wizard with a magic bullet to solve
their problem. And, why not, - most of life is mystery and magic to them.

I need help - my car won't start - what should I do?
Walk.
Ha-ha-ha. I need to get my car started.
OK. What is it doing?
Nothing - it won't start!
OK, does the battery have any juice?
I don't know.
Turn on the headlights - are they bright?
Yes.
OK, turn them off.
Now, try to start the car, do you hear a clicking sound.?
No, the starter cranking the engine makes too much noise to hear a clicking
sound.

(At this point I realize that it is futile to go further. He knows even less
about engines, and their cycle of operation, than I know about brain
surgery.)

I think the engine's framel-stamel is likely bent and stuck open. You can't
fix it yourself, and I don't have the necessary tools. You need to call a
mechanic who will come out - or have it towed to the dealer.
Are you sure?
Yes, you called me for advise - and that is my advise.

Jerry O.

[Hank]

Post by Jerry Osage

Post by Hank

Post by Jerry Osage

Post by p***@gmail.com
Hi Hank, I saw your email and thought perhaps you could help me too! My Onan 4000 Microquite does the same thing...only with a twist. When the technician has the voltage meeter probe inserted in Pins 9 & 10 or 11 and 12, it runs like a champ! If he removes the probe - the blasted thing quits. Any ideas?

OK, I've read Hank's response and I have the same question. What did the
tech say? Since you're asking here I assume your "Tech" was unable to
diagnose, and fix, the problem.
Do you have a wiring diagram? Can either you - or the tech read it? If so,
what does those pins 9,10,11, and 12 go to? What do they do? How was the
meter set? What was the tech testing for on those pins?
Does it have low oil? The low on oil sensor is by-passed when starting but
low oil or a bad sensor will stop the generator when the Start button is
released.
I'm trying not to be too snarky here, however, without more detailed
information I suggest that you take it to a Cummins/Onan repair center and
have it fixed. Or - buy the meter from the tech and leave it hooked up to
the pins.
--
Jerry O.

Good point! I forgot about the low oil sensor.
Hank

Notice that PE Jarrett hasn't responded. That doesn't surprise me. He most
likely did a Google search and your post popped up. He hasn't responded to
your post and probably won't. He probably won't even see it because he has
no idea how he found it in the first place.
I have always been short with people like this.
It never ceases to amaze me that people who can not define their problem
with any clarity, or depth, expects a Wizard with a magic bullet to solve
their problem. And, why not, - most of life is mystery and magic to them.
I need help - my car won't start - what should I do?
Walk.
Ha-ha-ha. I need to get my car started.
OK. What is it doing?
Nothing - it won't start!
OK, does the battery have any juice?
I don't know.
Turn on the headlights - are they bright?
Yes.
OK, turn them off.
Now, try to start the car, do you hear a clicking sound.?
No, the starter cranking the engine makes too much noise to hear a clicking
sound.
(At this point I realize that it is futile to go further. He knows even less
about engines, and their cycle of operation, than I know about brain
surgery.)
I think the engine's framel-stamel is likely bent and stuck open. You can't
fix it yourself, and I don't have the necessary tools. You need to call a
mechanic who will come out - or have it towed to the dealer.
Are you sure?
Yes, you called me for advise - and that is my advise.
Jerry O.
--
Ignorance is like alcohol: The more you have of it,
the less you are able to see its effect on you

...

I am ignorant about a lot things. I just can't know it all, but I am able to google most things. Over the years Google has saved me quite a bit of repair costs, time, and trouble. I am currently trying to fix my daughters refrigerator. I WILL learn a little something from that and I am happy I am still able to learn.

Hank

[d***@gmail.com]

I have a marquis 7000 doing this model number is
7NHMFA26105D
SERIAL F933048301

[Albert]

Post by d***@gmail.com
I have a marquis 7000 doing this model number is
7NHMFA26105D
SERIAL F933048301

Google it

https://www.justanswer.com/small-engine/5l9jh-onan-marquis-7000-will-start-run.html

Hope this helps?

[p***@gmail.com]

the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

[p***@gmail.com]

the ignition is being grounded. First, double check your oil level, make sure generator is reasonably level. If still not resolved, then locate the sending unit, and remove the wire that is on the end of it. There should be a connector either a few inches from the sending unit, or a few inches from the control board (coming from big white plug). Disconnect at either place. Try starting again. If it starts this time, double check oil levels. If those are fine, then sending unit has failed, or oil pump (if pressure unit) has failed. In either case, don't run for very long until sending unit is replaced, just in case.

[j***@gmail.com]

I have an Onan Emerald Plus, model 58GEFA11579P

Like many other folks it only works if the button is held in.

I tried cleaning the slip rings and put new brushes in.

After doing that it ran ok the first time I tried it so I assumed it was fixed. But the next time I tried to get it to run the same old
problem returned.

Any advice? Could I have hurt the regulator board?
Any easy way to check it?

Thanks in advance.

Joel


***@gmail.com

[George Anthony]

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

Check youtube. There are many suggested cures for the problem. Maybe one
would fix yours.

[Frank Howell]

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

It sounds like you were close to the problem with the cleaning, other
wise why would it work that one time?

[Hank]

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

One poster mentioned a possible low oil sensor malfunction or just low oil. Which is Possible.

another mentioned low voltage output.

Things I would do...
Fuel pump, switch or wire? Mice chew wires.
Unplug remote starter switch to see if that makes a difference.

Hank

[George Anthony]

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was
fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

Is it providing voltage while the button is held in?

[Chicken George]

Post by George Anthony

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was
fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

Is it providing voltage while the button is held in?

...

Once again Fido rising likes the phoenix just to show he is the best you can be with his attitude of yes we can to show the community that he is the best you can be as village idiot by answering the obvious but still manage to remain oblivious.

[Chicken George]

Post by j***@gmail.com
I have an Onan Emerald Plus, model 58GEFA11579P
Like many other folks it only works if the button is held in.
I tried cleaning the slip rings and put new brushes in.
After doing that it ran ok the first time I tried it so I assumed it was fixed. But the next time I tried to get it to run the same old
problem returned.
Any advice? Could I have hurt the regulator board?
Any easy way to check it?
Thanks in advance.
Joel

You have a disconnect somewhere, chances are good that when it run you pressed down on the connections and after shutting down that connection became loose again because generators have that shudder on shutdown.

[c***@cox.net]

Onan5500 MarquisGold. Gen starts fine.
When I release the start button, it kills. Need help!

[Hank not George]

Post by c***@cox.net
Onan5500 MarquisGold. Gen starts fine.
When I release the start button, it kills. Need help!

Sounds like an electrical problem. Could be anything in the wiring and switching systems. It takes a systematical approach. There is a wire (usually black) that grounds out the magneto so that it will shut down. If you can find that wire and figure out where is goes, you can disconnect it to check if it will run continuously after disconnecting it. You will have to reconnect to shut it off if it continues to run. At least this will tell you if something grounding out the magneto.

Hank

[Jerry Osage]

Post by c***@cox.net
Onan5500 MarquisGold. Gen starts fine.
When I release the start button, it kills. Need help!

The start/run relay is closed when the "Start" switch is closed.
When it is running and producing AC a part of the AC is rectified and holds
the run relay closed and you can release the "Start" button.

Try Here for more info.
<http://www.gmcws.org/Tech/dsimmons/onan/onan.html#start-circuit-schematic>

[George Anthony]

Post by c***@cox.net
Onan5500 MarquisGold. Gen starts fine.
When I release the start button, it kills. Need help!

Tape down the button :-)