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USMC46

Texas

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Posted: 03/09/12 07:32pm

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I returned home this evening and after a few minutes heard someting like a truck in my back yard. No truck...my Onan diesel generator in my coach was running. It had started on it's own. I went inside and switched the toggle switch to turn it off and it turned off. Any ideas ? Bad toggle switch maybe ?

Jim & Carmel
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2004 Dutch Star 41'
2006 Jeep Liberty
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rexlion

Broken Arrow OK

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Posted: 03/09/12 07:46pm

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Not sure what started it, but you might want to pull the spark plug wire off until you get it diagnosed.

past-MIdirector

Michigan

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Posted: 03/09/12 07:48pm

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Is your rig equipped with a low battery auto start generator? A lot of the newer rigs are equipped with this system.

wolfe10

Texas

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Posted: 03/09/12 07:49pm

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If no auto gen set start, check for water in your on-generator start switch or wiring at the generator end of the wires that go to the in-coach start switch.

Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240

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steveownby

Cosby, TN

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Posted: 03/09/12 07:51pm

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I assume you don't have auto gen start. Onan 7.5kw generators have been known to self start if moisture gets into the multi wire plug on the outside of the generator box. You might shoot some di-electric grease into the plug.

Steve Ownby
2003 Monaco Signature

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ohio4whlr

central ohio

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Posted: 03/09/12 08:13pm

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rexlion wrote:

Not sure what started it, but you might want to pull the spark plug wire off until you get it diagnosed.

Diesel gen. No spark plugs, also just pulling plug wire won't keep it from cranking.

dougrainer

Carrolton, Texas

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Posted: 03/09/12 08:28pm

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rexlion wrote:

Not sure what started it, but you might want to pull the spark plug wire off until you get it diagnosed.

1. Diesels do NOT have spark Plugs

2. BAD IDEA, If it cannot start, what happens to the starter or ring gear???????
3. To the OP, DISCONNECT the remote harness at the APU and check for corroded pins inside that connector. Onan Diesel remote connects at the APU are notorious for corroding out even with the rubber seals on the matching plugs.
4. If it starts after the remote plug is checked (OK) and you leave it disconnected, then water got into the switch/breaker housing area. Some Onan Diesels will start if water gets inside that housing. Doug