Question about Pontiac Cars & Trucks
A bad or lose ground ! Checking a wiring diagram would show if these thing's share a common ground . Transmission , instrument cluster lighting an the radio lights up with the instrument cluster . You can go onto youtube an check out videos on how to read a wiring diagram , how to do voltage drop testing , basic automotive electrical circuit testing . Then you could go to http://bbbind.com/free_tsb.html free wiring diagrams an test the instrument panel back lighting circuits ! You will need a DVOM - digital volt ohm meter an you will more then likely need to take parts of your instrument panel apart . Your probably better off taking your vehicle to a qualified repair shop .
Posted on Aug 04, 2016
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Apr 20, 2016 | Cars & Trucks
Jul 13, 2013 | Mitsubishi Lancer Cars & Trucks
Your shifter is a column shifter, not a floor shifter, right? Is the headlight switch mounted on the steering column? If so, then this "combination switch" may be the problem. If not, start looking for loose wires, especially ground wires, around the steering column area and the headlight switch area.
It would also be a good idea to get access to a wire diagram from a factory repair manual and find out if GM had any Technical Service Bulletins addressing this problem. If I get a chance, I will ask around and see if any of my co-workers ever heard of this problem.
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