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Old 04-22-2014, 01:00 PM   #1
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Onan Generator Issues

I have an Onan generator that was once in an RV and is operating on Propane. Model 6.5-3CR/16000A. The issue is it won't keep running. When the start button is pushed, it cranks over and fires a couple of times, then fuse F2 (IGN) blows and when the start button is released it stops cranking. I am using Onan Control drawing 611-1135 dated 4-8-77. At first it was thought the seal-in relays K2 and K3 were sticking in the open position, but both have been replaced. Then looked at the Diode CR1. When I checked CR1 with the diode test fxn on my multi meter, it appeared to be open both ways. I replaced CR1 with a new diode although it also checked open both ways (no tone). Can you enlighten me on how to check a diode like this one, it is obviously different than the standard .7 volt diode. Regardless, I'm quickly running out of thoughts, looking at the schematic on the drawing, I see there is a C1 that might be shorted or could the points S2 be causing the fuse F2 to blow? Something is shorting out causing an over current through F2 and I can't find it. The start Solenoid K1 must be working as the generator is cranking over as long as the start button is held in. Again, it only fires a couple of times, then that must be when F2 blows and it quits firing (makes sense because no more current to the points and plugs). The only other thing I see in the circuit is S3 the low oil pressure switch, but the oil level checks fine.

Does anybody have any thoughts or ideas of an Onan tech I can talk to?

Thanks, Steve

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Old 04-22-2014, 01:09 PM   #2
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Go to Cummins Onan and ask.

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Old 04-22-2014, 02:13 PM   #3
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I did that and all they would offer is a Tech to come out and look at the generator or I could bring it in. It's located at a remote location 3-1/2 hours away and at $123/hr plus $3.25/mile I can buy a whole new generator for what it'd cost just to have him look at it. It's way too heavy for me to haul around anyway. All I want is to be able to have the tech look at the same drawing (schematic) I'm looking at and answer a couple of questions. So much for customer service it seems.
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Old 04-30-2014, 08:18 PM   #4
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Sounds like a bad regulator
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Old 05-01-2014, 05:59 AM   #5
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If you don't get any help here, you could try Onan Generators - SmokStak
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Old 05-01-2014, 07:27 AM   #6
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Originally Posted by DonavonP View Post
If you don't get any help here, you could try Onan Generators - SmokStak

I agree. Excellent source for information/help.
04 Newmar DSDP 4015-Cummins ISL 370hp-Spartan MM Chassis-2013 Chev Equinox AWD Towed-Ready Brute Elite Towing System-FMCA 402879-SKP 120487
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Old 05-01-2014, 11:48 AM   #7
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Unplug the low oil level sensor, I have had mine go bad, like hitting the kill switch...
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Old 05-11-2014, 01:20 PM   #8
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Did you get it fixed?

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