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Whe was the last time you checked out your Onan? [message #357322] Wed, 29 July 2020 07:56 Go to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
Haven't run the Onan in a while so yesterday I pulled the drawer out to do a quick check before starting and loading it down. I spotted some of that greenish stuff on the connection under the Onan on the mounting plate. This is the INSULATED high current hot lead that splits out power from the house battery and goes up to the battery boost solenoid. When I grabbed the hot cable from the battery and pulled on it I noticed it was loose and there was some electrical arching. I immediately shut off the cut off switch for the house battery. The only way to really get at that connection is to take the Onan out. So, I pulled the Onan out of the compartment. The bolt thru insulation of the power lead was nearly all gone as it wiggled around in the hole. There was considerable evidence of arcing around the mounting hole. Looks like I dodged a bullet. Had I started the Onan who knows what might have happened. So, I spent the rest of the day cleaning up the area, replacing and rerouting cables.

Maybe everyone out there should at least check this insulated connection. With all of the GMC'rs out there that are running their Onan for house AC, this is a potential fire hazard. Be safe everyone.


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: Whe was the last time you checked out your Onan? [message #357323 is a reply to message #357322] Wed, 29 July 2020 09:10 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
Senior Member
Those all fail with time. Mine is now an in line Burndy splice with a good half roll of 3M tape over it. A single cable through grommet would be better.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: Whe was the last time you checked out your Onan? [message #357354 is a reply to message #357323] Thu, 30 July 2020 21:43 Go to previous message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
I have "fixed" two of those over the last few years. One was mine.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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