[cerial]

Is your cab sagging heavily in the front?

My 91 s10 is rusted bad to the point the cab actually was pressing the harness against the back of the block.

So I would hit a bump and it would cut the lights, radio etc. Not really a huge deal as they came right back on and it would only do it every now and then. Eventually it cut the truck off then it would go right back to normal a second later with only a "check engine" light illuminating for a second. It would only happen once every 20 days or so though and I figured it was a ground somewhere.

I replaced the main bat to engine and ran a new engine to chassis ground and called it good. I kept driving it for short runs etc. That little 2.5 would just go and the thing handled great. Did nothing for like 60 days so I thought I fixed it. I hit a bump and the thing straight up shut off. It would crank but that's it.

Towed it back to the house. Upon further inspection I fried the harness back by the head as well as fuse able links off the alternator and pretty sure the ecm or at very least distributor pickup is toast. The truck sits now waiting to be turned into something cool later.

So yea if your cab is sagging forward with like 1/2" fender gap at the bottom of the doors maybe you should check the back of the block to see if your harness is being crushed. I went through everything on that truck mechanical wise. But the body was not worth saving and the electrical worked so I left those alone. It will make a great chassis for a hotrod at the very least. But simply running my hand behind the head to do a basic inspection may have had that truck running today. Live and learn.