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Old 04-17-2016, 11:51 AM   #1
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Onan 10.0K Diesel Generator Control Board?

I have a 2007 Monaco Dynasty that the Diesel Generator will sometimes run for several hours and then die with an error message of low fuel pressure. Sometimes it runs for 30 mins and dies. I replaced the fuel pump (lift pump) and the problem still exist. With help from the local Cummins dealer they had me wire a hot wire to the fuel pump and bingo - fixed the problem!

The technician from the Cummins dealership told me the Control board on the generator is most likely bad.

My question - where is the control board? I've looked all over inside the generator itself - I don't see it - Am I just blind?

Would appreciate any help you can offer. I suspect it may be on the coach somewhere.

Model number of the Generator: 10.0HDKCA

Thanks!
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Old 04-17-2016, 01:31 PM   #2
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I don't know where the control board is located. Maybe we're both blind?

The generator on our coach did the same thing, it's 12.5KW Onan. Initially, I just hot-wired the fuel pump to +12VDC using an in-line fuse that I would install when we needed the generator. Worked flawlessly, but it was a bit cumbersome and my wife was reluctant to learn the "new" generator operating sequence. I finally got mildly energetic and installed a relay that turns the fuel pump on when the generator starts.

On our generator there is a multi-wire connector that connects the generator to the start/stop control circuits inside the coach. There is one wire in this connector that becomes and stays energized when the generator is running. I tapped off this wire to energize the relay that I installed to supply power to the fuel pump. The +12VDC that actually powers the pump comes from the main +12VDC feed to the generator from the coach.
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Old 04-17-2016, 05:07 PM   #3
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Thanks for the help. Glad to see I'm not the only one having this happen.

Once I figure out where the board is I'll post it back.
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Old 04-17-2016, 09:32 PM   #4
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Red face

The control board, if there is such a thing, must be in the generator enclosure. I've had the top off the generator enclosure and didn't see it. There's a few relays near the front passenger side, but not a circuit board that I recall. On top of the generator there is a plastic enclosure that I "assumed" just contained the generator leads as they come out of the generator. Maybe the control board is inside this plastic housing? I know this housing is plastic because I foolishly tried to ground my relay to it. You probably already know that plastic isn't a good conductor of electricity. I did too, but the housing looked like steel to me.

How were you able to change the fuel pump? On my generator it appears that one must have really long, skinny, and strong fingers or just about disassemble the entire coach. Well, almost disassemble the entire coach
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Old 04-18-2016, 06:51 AM   #5
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I found the service manual online: http://www.twinslan.net/~n0nas/manua...02-2004%29.pdf


Looks like the control board is under that plastic cover your talking about.

The fuel pump was easy to change - mine has an access panel on the bottom right side (look at the front) and the pump is just under that panel.
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Old 04-18-2016, 10:03 PM   #6
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Thanks!

Any idea what a control board costs?
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