Trailer Brake Fuse Blew Again

[Dieselnerd]

A couple of months ago I posted that I had blown the 30 amp trailer brake fuse in my truck. I received some good suggestions on what to check. My trailer is a 2006 but I went over every piece of brake wiring twice and it was perfect. I opened all the 7 pin connectors to make sure there was no little piece of wire shorting between terminals. All good. New fuse and hooked to trailer, everything worked fine.

Two days ago, on a trip, my BrakeSmart started beeping just after I parked in a campsite. It said on the display "Truck Battery Low". I reset it and it came right back. I stepped on the brake and the fuse blew. I'm assuming it thought the truck battery was low because the brake line was shorted at that time but didn't draw enough current to blow the fuse until I stepped on the brake.

Here's the thing, I wasn't towing my trailer, I had my slide in truck camper which doesn't use brakes. I wish I had pulled the plug before I stepped on the brake just on the off chance that the camper was somehow drawing brake juice.

I put in one of my spare fuses and the problem was gone again.

I'm going to remove the brake wire from my camper power cord just in case but I think the problem must be in the truck. I haven't really checked much on the truck since I thought it was a trailer brake problem. That's where I'll start when I get home again.

If anyone has any other ideas, I'm all ears!!