Hello, I have a head scratcher. '93 Lance Squire 3000 camper. New battery, with power to the inverter/converter (Magnetek Series 6300, 25 amp model 6325 with a Parallax 7345 Power Supply), and to the test panel on the wall, but only to the test button . No power from the battery feed is fed to the water pump switch on the test panel. There is NO 12v output to any of the lights or other 12v accessories from the battery feed. But when I hook up shore power, all 12 volt, and AC functions work properly. According to the manual, the inverter is automatic, with no need to switch between AC or battery . I fear the inverter was fried by PO. I did find a pair of wires coming off of the fuse panel that were bare at the ends and they could have shorted. However, the fuse to that circuit was pulled. I removed the wires, and replaced the fuse, but still no 12v off of the battery to the 12v circuits.
My questions are these. Why would the 12v functions work when connected to 120v shore power, and not when only powered by the battery. Shouldn't all 12v be dead ? I mean, a 12v power source should route 12v without interruption, shouldn't it ? If the inverter was damaged, shouldn't the 120v to 12v have the same issue of no output ? Also, why is the 12v output ran through the inverter, and not directly from the battery to the 12v sources anyways ? Is this done to prevent shorting of the 12v battery feed and the 120v shore power feed ? To keep them isolated from each other ? If that's so, why does the test panel have battery power, and additional 12v power to the water pump switch when ran off of shore power 120v ? Is the inverter repairable ? Or do I need to swap out the unit ?
Any advice to help me out is appreciated.