About a month ago, I came out one morning and my brake lights were on. They had not been on when I went in the night before. Sadly, my battery was drained enough that the truck had to be boosted. I checked the most obvious stuff, starting with the brake light switch. No change.

So I was looking around under the dash, and over to the left kick panel, towards the front of the truck from the parking brake, There looks to be a couple of gray wires that are cut. Not broken or anything, but cleanly cut. Messing with them though, still had no effect on the brake lights.

Finally I just started trying to find anything under there that would make the lights go off. I pushed against a wiring harness against the left fender wall of the truck and the lights went off. When they went off, I heard something that sounded like a solenoid under the dash click.

Fast forward a month. I've had no further issues. Of all times, I'm leaving my grandmother's funeral and I see that the brake lights are on. I try to mess with the same wires but no luck. After just random pushing, they went off and I went home. They were not on when I went in. But when I came out the next morning, my battery was dead again. Boosted the truck and traced the actual problem to a connection on that left wall. It is a big connector that goes in to some funky housing. I can squeeze around on it and the lights go off.

Has anyone had this issue before? Looking for an actual fix. Thought about putting a tie wrap around it to see if that would hold it. Just don't want to get stranded somewhere with a dead battery, or rear ended because my brake lights are on all the time.

2007 H3 Auto

 

Check the wire harness behinfd the back bumper. Sometimes it rubs and the wire contacts the frame causing the brake lights to do weird things depending on which wire grounds.

 

Thanks Tainter. I'll check that.