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Another head scratching question


Brett63
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Today when I was unhooking everything ont he coach in order to try to do a rest on the MUX I found something I cannot explain, maybe someone here can.

I unplugged from shore pedestal, I opened both batt disconnect switches, I completely removed + battery cables from all batts (chassis and house), I turned of the solar controller, I turned off the inverter and charger.....I mean I unhooked and turned off everything. I was dead coach.......

BUT I still had 12v power in the front run box on the house side feeding the multiplex system.......Where is that power coming from.....lol I finally disconnected the + lead right at the computer in the FRB so that it had no power. But how with everything off and disconnected did I still have 12.5v in the FRB on the house side?

What am I missing

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