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Old 09-08-2016, 09:38 PM   #1
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Onan starting on its own?

Has anyone else had issues with their light plant starting on its own?
I have a 2006 Monacco SE V-10, with a 5500 Onan Light plant.
Realized yesterday that the light plant had started on its own....after playing around with the cab starter button I disconnected the main motorhome battery.
Today I went out to the shelter and the was plant was running again.
Iíve now disconnected the battery at the plant. But wondering if anyone else has had this problem and if anyone knows why or how it is possible for it to start on its own with nobody around.
Maybe we have a ghost??
Any suggestions would be most welcome.
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Old 09-08-2016, 09:41 PM   #2
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I had one to that. It was some crud in the external (generator-mounted) starting switch. I replaced the switch and solved the problem.

When I opened the old switch for inspection, it was filled with rust.

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Old 09-08-2016, 11:06 PM   #3
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have you checked to see if the previous owner or dealer installed an AGS (Automatic Generator Start) module?

They are typical set to come on when batteries discharge to a preset point or when the temp inside the RV hits a preset to allow the AC unit(s) to come on.
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Old 09-09-2016, 07:19 AM   #4
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Quote:
Originally Posted by oldmattb View Post
It was some crud in the external (generator-mounted) starting switch.
This is a relatively common issue, particularly in hig humidity conditions. It can normally be cuts by cleaning up the switch contacts.
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Old 09-18-2016, 12:44 AM   #5
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Yeah, does yours have an Energy Command onboard? If so check it's settings and disable the auto start feature. The easiest fix is to disconnect the house batteries via the switch, if you have one. Most generators run off the House batteries so open circuiting them will take away the DC voltage needed by the gen set to start.
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Old 09-18-2016, 08:12 AM   #6
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Common problem, usually caused by moisture in the switch (remote more often than the main). Once in awhile it's a bad wiring harness for the remote switches. Try a hair dryer on the switch for 20 minutes or so and see if that dries it out.
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