LynnandCarol wrote:
OP... The Problem is when I disconnect shore power, we have no 12V power. The battery voltage was tested on the battery terminals with nothing connected.
So, with meter connected across the battery terminals and trailer plugged in to shore power, you read 13 volts but as soon as you unplug, the reading drops to zero? If so, the batteries are not functioning at all.
If you do have 12 volts on the batteries when unplugged from shore power, but no power to the lights, check the battery isolator switch, usually near the trailer door.
Incidentally, I don't think anyone mentioned in this thread that batteries indicate a misleadingly high voltage for a few hours after any charging. With a voltmeter you can only read the approximate charge level after not charging for a few hours.
