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Old 06-12-2015, 03:07 PM   #1
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Who had generator issues fixed by onan/cummins/

So my generator set has a problem where it will cut off while driving. I cannot duplicate the issue, and thought it was fixed. I thought I read someone here that had theirs fixed with some wiring being the root cause, but cannot find that post.

My Onan dealer has another similar jayco with similar reported issue, and they are now able to replicate the fault on that unit by driving over railroad tracks while the AC is running, aka under load. Onan is hoping it is a coach wiring issue, but I fail to see how that could be. My gut tells me that Gen set has some wobbly bits that don't like any sudden jarring while under load and will cause the gen set to stall.

Any thoughts?
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Old 06-12-2015, 03:48 PM   #2
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Some corrections to the above statements.

Current Onan dealer cannot get Gen set to cut out when the AC is not on.

Maybe the AC is wonky and causing a double cycle.

We will know more later. Mine will run the same circuit of testing on Monday.
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Old 06-12-2015, 04:40 PM   #3
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My generator in both a 2015ul Precept and 2015un Precept would shut down while driving. My issue was the oil level had to be exactly at the full level. If it was down just a little the gens would shut down on curves, coming to a hard stop, etc. No problems since keeping the oil level exactly full.
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Old 06-13-2015, 10:08 AM   #4
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If it is a loose connection or poor ground you maybe able to replicate it while parked in a driveway by shaking and lightly tugging on the wiring connections. Also how was your fuel level if you were getting close to 1/3 tank and hit some bumpy ground maybe the gas sloshed around and couldnt reach the pickup causing it to stall. I couldnt get my gen to start one day then i rembered my dealer telling me they shut off at 1/3 tank.
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Old 06-13-2015, 08:07 PM   #5
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Greyhawk01 Fuel is not the issue. As a matter of fact, mine will continue to run right down to the 1/8th of a tank mark if we let it.

My Onan Dealer is monitoring this thread to see if anyone comes forward with a fix or something that another owner might have done to combat this similar issue.
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Old 06-14-2015, 02:35 PM   #6
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I think you are looking for my information on a previous post regarding the generator in my 31 FS motorhome. The issue with my Onan was that it would shut down after 20 or 30 minutes. I took it to Cummins Service Center in Tulsa as it was under warranty. It also did the same thing for them and shutdown on Code 36. While inspecting wiring they found remote harness wires going into genset near fan hub. They pulled out remote harness and inspected wires. 3 wires had been rubbing against fan and were down to bare wire. The wires that were bare were the start, stop and ground wires causing shutdowns if bare stop signal wire ever came into contact with fan. They repaired remote harness wiring. Since this repair the generator has never repeated the problem and works great. Good luck with diagnosis on your generator. It is an item that in certain places you want to depend upon.
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Old 06-14-2015, 07:11 PM   #7
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Exactly! The search function here leaves a bit to be desired.

Headed to Alaska, so YES I will need it.
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Old 06-16-2015, 03:58 AM   #8
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Got word that my fuel pump was making unusual noises, so they will be replacing it.
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Old 06-16-2015, 06:38 AM   #9
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Cummins ran mine for 8 continuous hours testing before I got it back again. I would think that once you get it back from your Cummins dealer that it will be fine. Do keep us posted on your experiences there in Alaska.
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Old 06-16-2015, 07:43 AM   #10
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Quote:
Originally Posted by CarlB View Post
Exactly! The search function here leaves a bit to be desired.

Headed to Alaska, so YES I will need it.
heading to Alaska 7 July
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