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You devinitely have a breakdown in the chassis 12 volt. Start with verifying a good ground and battery negative connection. Then start at the chassis battery and do the same thru the chassis battery disconnect; checking for voltage drop at each component down stream. You should get to the front driver compartment where you will be half way through the feed circuit. Let us know what you find.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7