Battery not working on own
I'm looking for a bit of help. I just purchased a Jayco Eagle HT 27.5 RLFT.
When I am running off of just the battery the battery reads dead (No lights and nothing works), when I plug in the campers 30 amp, or hook it up to the truck it reads full (All lights, everything works).
I've used a multimeter to check the battery and it reads 12.37v when not hooked up to anything (no lights and nothing works). and 12.37v when I have the 30 amp plugged in (all lights and everything works)
Did the guys at the dealership hook up my battery incorrectly? What do I need to do to get the camper to run on just its own battery?
Hope it's something easy!