hmm to fry or not to fry

Better to be safe than homeless. Is the 50A fuse what the specs call for? If so, then you may have a different problem. Sometimes it's as simple as a corroded or lose ground wire. Better get someone with a meter in there to start checking wires (do the easy stuff first), then check out the lights, the wiring and the A/C. No, I have no idea how any of that stuff works, just that waking up in a fire in NOT good. And make sure whoever is checking knows what they're doing! It may just be something simple, but you won't know until it's checked out.
Good luck and drive safe.
Mary

 

Whoever told you that the truck will catch on fire just because the low voltage disconnect is going off is an idiot. Get your batteries load tested, obviously they are not holding charge if it is kicking them off after 15 minutes. Also get your apu charging system checked out, it should not kick off the lights with the apu charging the batteries. Or it could be a faulty LVD. You can by pass the LVD which is located behind the passenger side kick panel by unplugging it and reconnecting the wires, does not harm the electrical system, just will not turn off non essential electronics when the batteries drain down.