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Old 07-26-2010, 04:31 PM   #1
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12V Electrical Problem in HR Ambassador

Can anyone help me in getting a wiring diagram for the 12V Battery system in a 2009 Holiday Rambler, Ambassador, 42 ft, 360 ISC Cummins? I have no 12V power in the unit and I have checked the battery disconnect, I have good batteries, and was told it could be a fuse between the disconnect and the switch on the inside of coach to turn on power. The solenoid appears to be working when you press the power button. You can hear it clicking. Any help is appreciated.

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Old 07-27-2010, 02:46 AM   #2
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No wiring diagram but follow the 12+ cable of the battery bank to a fuse. Be sure to check the ground cable to frame. Good luck and keep us posted.

Mike, RVIA & RVSA Certified Master RV Technician
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Old 07-29-2010, 12:45 PM   #3
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I lost power one time and it was a fuse popped on the inverter. I was hooked to shore power at the time. Pushed the fuse back in and all has been fine ever since. This was located in the back, curb side compartment in a 2004 Endeavor. Hope this helps.
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Old 07-31-2010, 07:20 AM   #4
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I previously had intermittent problems losing 12V power on my 07 Knight. I finally just by-passed the solenoid in the outside drivers bay. It can be done very easily and is a good interim fix. You then can take your time to determine what the exact cause of your problem might be. Could be the battery cut-off switch or solenoid. Here’s a link to a previous post to by pass the solenoid.


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Old 08-03-2010, 05:54 AM   #5
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Thanks to everyone for the advice on the 12V. We have it fixed. It turned out to be a hot wire going from the AC panel to the 12V panel had come loose and was laying in the cabinet behind the 12V fuse box. All of the information provided was very helpful and was in line with the advice from Monaco.
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