Help! Lance 850 isn’t getting power from truck battery

[Seminoe_Joe]

Just installed a new camper side plug because the old one was damaged. Connecting everything right, camper was drawing power from the truck yesterday when I left home. Last night and today, no dice. The driving lights all work, so the plug’s not the problem. A voltmeter tells me that the wire in the camper is getting 14.6 volts when the truck is running. Looking around for any fuses or breakers that might be bad, but all is good. So…what the heck is going on here?! Anyone experience this before? Any suggestions for what to try?

[CA_Traveler]

OK on alternator but not battery suggests bad battery or connection. Load test the battery and test the voltage from the battery posts - (not the cable connection) to frame ground and battery post + to the 12V wire to the camper.