2012 Pete 386 Headlight issues

I had that trouble on a conventional KW one trip with my right side headlight many years ago. Where I loaded in California I checked everything and when I left it was working just fine. Going through Van Horn, Texas at night time a trooper a stopped me, my right headlight was not on. We walked around to the front of my truck and I hit the side of the fender with my hand and it came on burning brightly.

I stated, "Its now working!" The trooper said, "You’re a smart ###." When he said that I feared he would look deep and find things wrong. I quickly apologize to him telling him I had trouble with it and had worked on it out in California taking several of the connections apart and putting them back together and it started burning and I thought I had it fixed. He settled down a bit and just gave me a warning ticket telling me I need to get it checked out. I promised him I would.

And that was the last time I had trouble with it. So I take it that last hand bump fixed the problem. Stuff like that can be hard to find at times. Hope you will find the problem.

 

Just inside the frame on the drivers side almost behind the starter there is a thick harness with a plug with about 12 pins in it. Unplug it, and look in the female end. You will notice two half melted pin holes. These are poor ground connections. Splice these 2 wires, bypassing that connector, and you will have this problem no more. Peterbuilt didnt use a strong enough ground circuit to compensate for what happens when your battery cables bounce loose from your negative posts like they do. So these tiny ground wires heat up. They do ok, until they melt these 2 pin holes.

 

I've noticed on newer trucks the wiring has become very thin.I can only imagine the price of copper and the need to save a nickel is causing truck builders to make substandard wiring harnesses, what's next, Aluminum?