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Old 06-17-2012, 12:20 PM   #1
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3am Onan diesel generator starts?????

Okay we are all sound asleep and all of a sudden the roof air turns off and I here a motor running go to the front of our coach and here the genny humming along nobody started it, the kids dont know how to and my wife and I were out cold. In the 6 years we have used our rv we have never had this happen is it something crazy or do we need to look into this more the generator is a onan 7500 diesel any help would be appreciated.
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Old 06-17-2012, 12:25 PM   #2
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Does it have the auto start option? If so, when the batteries get low it starts up on its own to charge them.
Or
Are you parked near a graveyard? Ghosts and all
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Old 06-17-2012, 12:28 PM   #3
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Were you recently driving in the rain or camping during a heavy rain?
If so, there is a multi pin connector on the front top of the generator where the wire harness is connected and if it gets wet, the generator will start on its own. Check this connector and spray some WD-40 into it to displace any moisture.

Pete
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Old 06-17-2012, 12:29 PM   #4
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You apparently have an auto-start generator. Since the AC was on, I will assume you were on shore power. So it's my guess you lost shore and the genny started. Don't know a whole lot about auto-starts, just that they can be set to start under certain conditions.
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Old 06-17-2012, 12:57 PM   #5
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I agree also with the auto start was activated.
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Old 06-17-2012, 01:01 PM   #6
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To my knowledge we do not have an auto start we have owned the rv since new kind of crazy
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Old 06-17-2012, 01:20 PM   #7
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Auto start does not automatically start the generator if shore power is lost. They are set up to start if the batteries get below a preset voltage. Mine is set at 11.6 volts. My autostart is part of my Xantrex inverter/converter.
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Old 06-17-2012, 01:51 PM   #8
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Quote:
Originally Posted by camping fam
To my knowledge we do not have an auto start we have owned the rv since new kind of crazy
If you don't, then still something tripped the start circuit. Either something like PeteB said or one of the kids hit the start switch whether they knew it or not. Sure can't fathom anything else. Perhaps an excercist may be in order Good Luck.
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Old 06-17-2012, 01:54 PM   #9
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It's a known issue. PeteB in post #3 is correct.

A search will find previous threads discussing this issue.
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Old 06-17-2012, 02:32 PM   #10
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Our Onan 7500 did that one time. We came home from a movie and the Genset was running. Very spooky, we could have easily been in Hawaii for a week when it happened.

I believe it is moisture/humidity problem as we had a heavy rain that day. By the way our RV is in a garage.
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Old 06-17-2012, 02:37 PM   #11
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Check this discussion about the same thing happening.
Onan auto starting - Escapees Discussion Forum
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Old 06-17-2012, 02:54 PM   #12
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Easy enough to check for an Auto Start.. Disconnect from shore power and let the batts run down some..
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Old 06-17-2012, 04:15 PM   #13
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Yea it does not have an auto start feature we will check that plug out tomorrow thanks again for all the help
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Old 06-17-2012, 04:42 PM   #14
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Quote:
Originally Posted by Mike Canter View Post
Auto start does not automatically start the generator if shore power is lost. They are set up to start if the batteries get below a preset voltage. Mine is set at 11.6 volts. My autostart is part of my Xantrex inverter/converter.

your wrong. mine on auto start will start automatically if shore power
is lost
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