aux. batteries won't charge with shore power

Mikeborny wrote:
Yes, when i shut off the aux. power switch while connected to shore power all the lights go out? I am a novice when it comes to this, but I thought the shore power would bypass the aux. batteries.

OK, you stated that when you run the APU (Generator) the Aux (call them Coach and call the Main chassis from now on), the Aux(coach) charge. But NOT on shore power. That does NOT make sense. The only difference between Shore and APU is WHICH is supplying 120 power to the RV, IF the APU supplies power to the RV and the Power Converter(the 12 volt charge appliance in your RV) is operating, then it will also on Shore Power. The APU does NOT charge anything. It has no charger, but supplies 120volts to the RV so your Charger (power Converter) does charge. Yes, you are missing something. Connected to Shore Power, (with bad or NO batteries) you will still have 12 volt power in the RV. How long did you run the APU to "charge" the batteries? It would take at least 6 hours or more to charge a dead or low battery bank, from the APU OR from Shore Power. Now, "some" RV's if connected to Shore Power (or APU), the "Aux Power Switch" (battery disconnect) if OFF, will still have 12 volt power to the RV(the power Converter), but the Battery disconnect will not allow 12 volt power to keep the Aux batteries charged and some OEM's connect the LP/Co detectors direct to the batteries and THAT load will drain the Aux batteries. A quick test to verify this is to unplug the Shore Power cord and IF the 12 volts goes dead in the RV, the Aux switch is indeed OFF. Doug