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Old 07-04-2014, 09:15 AM   #1
Rivet Master
Al and Missy's Avatar

2002 30' Classic S/O
Melbourne Beach , Florida
Join Date: Nov 2013
Posts: 4,007
Loose Connection at Negative Busbar

I was disconnecting the trailer when the tongue jack quit working. It had been making noise so I was afraid that it had finally died. A quick check showed the light didn't work either. Whew! A wiring problem is better than replacing the jack.

No power to the jack. No power at the fuse. No power at the positive battery terminal (measured to the ground lug inside the jack). What the ???

Measured to the negative post of the battery and everything is OK. A look at the wiring diagram shows the negative cable runs to a Busbar near the converter. Sure enough, the cable had pulled out. It was crushed like it should be from the clamp screw, but when I went to put it back in, the screw felt tight. I guess a strand of the wire got in the threads and made it feel tighter than it actually was.

With this failure, nothing battery operated was working, including the trailer breakaway switch operating the brakes. Vehicle brakes would have worked as they run from TV battery and ground.

Check your Busbar connections periodically. This would have been a real pain while camping. Luckily I was in my driveway.


“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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Old 07-04-2014, 03:31 PM   #2
Rivet Master
2005 19' Safari
Join Date: Aug 2004
Posts: 2,453
We had the same problem right after taking delivery of our 19-foot Bambi in 2005. Guess that guy was still working there in the factory.
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