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Old 03-25-2019, 12:44 AM   #1
Junior Member
Join Date: Mar 2019
Posts: 2
Question Onan 8000 Diesel Generator Not Cranking

I have an Onan 8000 generator, that will not start, will not crank. I have done some basic diagnostics I will list.
Checked power to generator. Power was 12.67v at generator studs.
Checked power to starter. Big lug on starter solenoid has power, 12.67v
Fuel pump not running when start switch is depressed. I unplugged the fuel pump and ran 12v to it and the pump works so apparently the start switch is not sending power to the fuel pump.
Starter works. I jumped the starter and the started engages and spins the engine. So apparently no power is being sent to the small wire on the starter solenoid to engage starter.
I ran the fuel pump manually and jumped the starter and it cranks and fuel pump is pumping but still no start after about 1 minute crank.
There are 3 fuses, 2-15a fuses and 1-25a fuse behind the small panel above the start swtich. All fuses are good as well as there is power where these fuses plug in at 12.6 v.
There is no power at the start switch. Switch does not light, cannot pull a code.
There are 5 wires on this switch not one shows any voltage.
There is no power at the 2 wires that plug into what I believe to be an injector or injector pump controller. Not sure just what that is. It is above the oil filter at top of the engine under with a plastic cover.
I messed with this generator for about 3 hours tonight. Now I know what is not wrong with it but still looking for what IS wrong.
I am starting to think a control board or comptuer issue.
Any ideas?
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Old 03-25-2019, 06:16 AM   #2
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Tiffin Owners Club
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Location: Where we park it!
Posts: 13,146
Welcome to the forum.
I assume that you have tried holding the start button down for a minute to "warm" the system up.
Have you called Onan?
Good luck
2018 Tiffin Allegro RED 37PA
2020 JEEP Trailhawk
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Old 03-25-2019, 09:40 AM   #3
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Join Date: Mar 2019
Posts: 2
No power to the start switch. I could hold it for a week...nothing.
There is something I didn't check and I hope to get to today. Since there are 2 start switches, it may be possible the power goes through the switch inside the coach before it goes through the switch on the generator so maybe a problem up there.
No I haven't called Onan yet.
I have been looking around for a service manual though.
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Old 03-25-2019, 11:13 AM   #4
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Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 52,841
Hi Steve! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with that! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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