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Wiring house batteries George Moody 8-27-17  
Why does frame ground have 12+ volts, is it coming from other 2 batteries on engine
Re: Wiring house batteries Bubba The Bus Tech 8-28-17  
So you were measuring with a digital multi-meter from chassis ground to Negative battery terminal on the House batteries?

Because there are continuous draws, LPG detector for one, and your digital Multi-meter draws no power to speak of it will measure the battery voltage POTENTIAL waiting to be connected.

Check to be sure your wired up correctly as the meter may be "Fooling you" or there may be a reversed polarity on your battery connections.

Good Luck
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