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Old 08-27-2021, 03:30 PM   #15
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I had 2 out of 3 glow plugs bad and it would barely start in warm weather.
When you remove the generator top cover the glow plugs are screwed into the cylinder head similar to spark plugs. There are three and they will have a retaining nut on the top to hold the wire on.
I replaced our glow plugs with three new NGK 5392 Y720U glow plugs ordered from Rock Auto. They are about $10 each from Rock Auto and over $40 each from Cummins.
Our 2004 model Onan uses an Isuzu 3 cylinder engine and the newer ones use a Kubota (although both engines are very similar).

You should be able to use an alligator clip on your volt meter wire and check voltage when you are depressing the start button.

Another helpful tip. The Onan 10k and 12.5k diesel generators use the same fuel filters as the old GM 6.2L diesel pickups.
HASTINGS / BALDWIN FF855
FRAM P3940A
WIX 33136

Hope this helps.
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Old 08-28-2021, 12:24 PM   #16
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Fuses may have to be pulled out after removing one screw. Near the start button on the generator. The radiator fill is inside there too as I recall. I have not been in there in ages so my memory is dim. Glow plugs are easy enough to change and may as well do all three after verifying they are getting power.

https://1drv.ms/u/s!Aqrv2TUdbV6xjmyL...qhQqM?e=JTM72F

There is a service manual in these files.
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