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Old 05-18-2011, 10:58 AM   #15
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Location: Rancho Cucamonga
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ok had a brain f**t...

Money is tight and I hate when things dont work. Had a thought. Until I take the time and $ to have someone repair properly, would this work?: identify at the house batteries the hot link with the coach battery and put in a disconnect switch that I would throw when we are dry camping to disconnect and back on when driving? Is this too Mickey Mouse for a short term fix?

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Old 05-18-2011, 11:11 AM   #16
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Why don't you just disconnect the chassis battery from the solenoid. The alternator will still charge the chassis battery when the engine is running and the converter will still charge the coach batteries when plugged into shore power. Just make sure you isolate and insulate the hot wire from everything.

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Old 05-19-2011, 09:28 AM   #17
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lezmark, the link between the house and chassis battery is in that box. It is some 3/8" busbar between the "Salesman" relay and the isolation relay. If you can get to the connections you can remove it, but it does not bend so you'll have to remove both ends to get it off.

How about this, find the wire from that box that goes to your chassis battery and try disconnecting it from there? IIRC, my Ford-based chassis has a wire from the box to a hex bolt on the battery terminal connector, it should be easy to disconnect it there. Of course, you'll have to tape up the wire well so you don't accidentally short your house batteries! You can always put your switch in there.
Stewart, Brenda and kids
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2006 Roadtrek Versatile 210
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Old 06-04-2011, 06:07 PM   #18
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Did you have your rv plugged in, solar panel operating, or generator running, or another charge in use when you took your measurement? If so things may be working properly. If you have the "bird" type setup, then anytime either bank of batteries sees a charge voltage it will pull a large solenoid in and combine the batteries.
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Old 06-05-2011, 08:57 AM   #19
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I actually established it was the battery cut off switch. In my Newmar, the nice little box that holds it is conveniently located up behind an air vent and the air cleaner right up top of the engine compartment. I knew what had to be done but i just couldnt get in there well enough to see and i didnt want to take a chance crossing wires or something and took it to a local guy. He charged me just over $200 to replace. In this case, money well spent and all is now well!.

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