Wiring troubles

start with battery connections, make sure there clean and tight, then keep checking for loose conection, probably a loose ground.

Look and tighten.

 

Last six of VIN.

 

I'm having the same issue it just started today. Nothing on top of my cab works, clearance lights, dome lights, radio and cb. I think it's a bad ground somewhere hopefully I can track it down With no wiring diagram either peterbilt won't give it to me either!! I'll let you know what I find out. Also if anyone has a wiring diagram for peterbilt 348319 would be much appreciated

 

Here you go on wiring diagram. You will get good with marquee zoom function.... 239 is ground for those circuits. Good luck.

 

My suggestion is to check all the ground wires that run to the frame.

For the CB or any circuit that flickers, Etc, run your own ground and see if that eliminates your problems.

If you run a direct ground from your CB and that does not stop it then you need to look on the positive side.

 

Awesome thank you!!!

 

Does anyone have a wiring diagram from the stock Concert Class radio in a 2022 Pete 579? Looking for the steering wheel controls after replacing it. Thanks!