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Old 03-12-2021, 06:13 AM   #1
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Location: Logan Indiana (Near Cincinnati Ohio)
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10KW Onan shuts down in the rain

I have searched around on this and have not found anything.

My 05 Executive 10KW Onan will shut down if driving in the rain. Takes maybe 20 miles of rain and just shuts off. The start stop light may be dead or may randomly flash and certainly will not crank or prime when asked.

10 miles or so out of the rain, all is normal again.

I have replaced the start stop switch in the unit, checked, cleaned and put lube on the large plug that connects the genset to the coach wiring.

I have pulled over in the rain and checked the genset, it is basically dry.

Wondering if the wiring is perhaps breached somewhere and the tires are pushing water somewhere into the wheel wells and wire bundles that is causing an issue.

I have not caught it "yet" after it shuts down fast enough to pull over, unplug the main interface wiring to see if it will then start back up. Obviously, this would tell me coach or genset wiring.

Till then (because this happens so rare I drive with the genset on in the rain), anyone ever heard or experience this?

Thanks
Windecker
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Old 03-12-2021, 06:17 AM   #2
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There should be a wiring harness on the passenger side of the generator that connects to the house wiring (start/stop switches etc). It is possible that you problem is there. Take the harness apart and dry it out, spray it with some Electraclean and put some dielectric grease on the pins and possibly even a little on the weather proof harness, this may keep out moisture.



The harness is known to cause random starting.
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Old 03-12-2021, 11:42 AM   #3
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Thanks Jim, that was the first thing I did. It did not change anything
Windecker

Quote:
Originally Posted by jacwjames View Post
There should be a wiring harness on the passenger side of the generator that connects to the house wiring (start/stop switches etc). It is possible that you problem is there. Take the harness apart and dry it out, spray it with some Electraclean and put some dielectric grease on the pins and possibly even a little on the weather proof harness, this may keep out moisture.



The harness is known to cause random starting.
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Old 03-12-2021, 05:04 PM   #4
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Windecker - I believe if you take a closer look about a foot to 18" back from the plug on that remote harness you will find where the MH harness is connected to the pigtail that came with the generator - usually with butt connectors - prone to corrosion etc. ( As a side note, this is also where I found the hour meter output connected to the charge disable relay - which disables the belt driven alternator ) Could be worth checking out if you haven't already.
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