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10-21-2019, 08:45 AM
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#1
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Senior Member
Join Date: Sep 2019
Posts: 122
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ONAN generator
I am having issues with my on board generator. It is an ONAN 4k microtite model E. I have replaced the carb, fuel pump and delivery is working, fuse and breaker is good. I can try and start and it seems to want to start, but shuts off as soon as i let go of start button. I have tried to disconnect the wire for the oil sensor, no luck. I have tried oil level filled on low side and high, no luck. It is a new to me motorhome and this is one of the main things that i cant figure out. Since it is in the motorhome it makes it slightly tougher to work on, so detailed instructions help a bunch. Any help would be amazing.
__________________
new to me 1997 Pace Arrow 30
always a work in progress
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10-21-2019, 08:52 AM
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#2
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Senior Member
Join Date: Aug 2013
Location: Northeastern Nebraska
Posts: 969
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Try this forum. They helped me out with my Onan. There are some real experts on there.
https://www.smokstak.com/
__________________
06 forest river Cardinal 34 TS towed by 03 freightliner Columbia HDT 435 hp 60 series Detroit, 10 speed, 3:55 gears with full locker. 260 inch wheel base. I am a Father, Farmer, and A Trucker.
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10-21-2019, 08:54 AM
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#3
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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This is one of the most common failures. Often the gen is not creating power.
Here is one of many troubleshooting guides. Also, the manual should be at the link;
http://www.twinslan.net/~n0nas/manuals/onan/
__________________
1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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10-21-2019, 08:54 AM
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#4
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Senior Member
Join Date: Mar 2017
Location: Waretown
Posts: 426
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Spark plug?
Fuel may be at or below 1/4 full.
No A/C output
__________________
Bill 3rd
2016 Sunseeker 3010DS
2017 Ford Fiesta toad
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10-21-2019, 08:57 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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Here is a little t/s chart out of my 4Ky manual.
__________________
1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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10-21-2019, 08:58 AM
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#6
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Senior Member
Join Date: Sep 2019
Posts: 122
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Fuel level is good. Rv is near full on gas. Spark plug is good. Ive tried to do most of the easy stuff. Also since i just got it i went through all that from the start. I have seen plenty of these trouble shooting guides but cant ever figure out exactly which terminals to test for most of them.
__________________
new to me 1997 Pace Arrow 30
always a work in progress
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10-21-2019, 09:05 AM
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#7
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Senior Member
Join Date: Sep 2019
Posts: 122
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That trouble shooting chart is where i get confused. I for some reason cant figure out what terminal block is what and where to test what.
__________________
new to me 1997 Pace Arrow 30
always a work in progress
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10-21-2019, 09:10 AM
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#8
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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Quote:
Originally Posted by Joestein
That trouble shooting chart is where i get confused. I for some reason cant figure out what terminal block is what and where to test what.
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Then you need to download the service manual and read. Sorry, but all the info is there if you research.
I agree if you get a to a really difficult problem than the guys at Smokstak are awesome.
__________________
1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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10-21-2019, 10:28 AM
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#9
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Senior Member
Join Date: May 2017
Posts: 157
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Mine did a similiar thing, turned out to be generator brushes. If no electrical output, genny will shut down immediately. Less than 100 to have brushes replaced by a professional genny guy.
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10-21-2019, 10:32 AM
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#10
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Senior Member
Join Date: Sep 2019
Posts: 122
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How do you test what the output is? Just on the plug? Will it output power while it's trying to start.
__________________
new to me 1997 Pace Arrow 30
always a work in progress
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10-21-2019, 04:23 PM
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#11
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Senior Member
Join Date: Apr 2004
Posts: 3,777
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My 4K Onan had the same symptom in April. An Onan shop replaced the circuit board. Again in Sept. and this time it was worn brushes. This is a relatively new generator that I bought because I didn't want to spend lots of money to repair a 1999 Onan with a shorted rotor / stator. C'mon Honda, offer a built in RV generator as an alternative to Onan.
Quote:
Originally Posted by airshot
Mine did a similiar thing, turned out to be generator brushes. If no electrical output, genny will shut down immediately. Less than 100 to have brushes replaced by a professional genny guy.
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__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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10-21-2019, 04:54 PM
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#12
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Senior Member
Join Date: Sep 2019
Posts: 122
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It is out of a 97 pace arrow. I don't want to spend a couple Grand on a new one, and don't want to spend a grand on repair to find out I need a new one. I'm cheap, so rather at least try and figure out if it's worth it to fix.
__________________
new to me 1997 Pace Arrow 30
always a work in progress
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10-21-2019, 10:40 PM
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#13
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Senior Member
Join Date: Nov 2017
Posts: 965
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I would suggest that it was not started regularly and the fuel in the carb has gummed up.
Today's fuels will go unstable in 30 days and will gum up your carb.
Try adding 1 -2 bottles of injector cleaner into the gas tank and allow it to get into the carb and clean the injectors.
You may also need to spray "Fire Starter" directly into the. carb just to get it started.
After you get it running, add fuel stabilizer to the tank if the genny is not going to be used under a load for any period of time.
__________________
Jim.B
Southern Ontario
2014 Fleetwood Southwind 32VS 🇨🇦
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10-21-2019, 10:50 PM
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#14
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Senior Member
Join Date: Jun 2017
Posts: 2,807
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Quote:
Originally Posted by Joestein
I am having issues with my on board generator. It is an ONAN 4k microtite model E. I have replaced the carb, fuel pump and delivery is working, fuse and breaker is good. I can try and start and it seems to want to start, but shuts off as soon as i let go of start button. I have tried to disconnect the wire for the oil sensor, no luck. I have tried oil level filled on low side and high, no luck. It is a new to me motorhome and this is one of the main things that i cant figure out. Since it is in the motorhome it makes it slightly tougher to work on, so detailed instructions help a bunch. Any help would be amazing.
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Quote:
Originally Posted by Jim.B1
I would suggest that it was not started regularly and the fuel in the carb has gummed up.
Today's fuels will go unstable in 30 days and will gum up your carb.
Try adding 1 -2 bottles of injector cleaner into the gas tank and allow it to get into the carb and clean the injectors.
You may also need to spray "Fire Starter" directly into the. carb just to get it started.
After you get it running, add fuel stabilizer to the tank if the genny is not going to be used under a load for any period of time.
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