Pontiac Problems? Ask a Mechanic for Answers ASAP
im cam, a licenced diagnostic tech.
can i have your vehicle info , year and engine and auto or manual thanks.
and ill pull up a diagram!
sorry, i do not have the wiring diagram for this one.
i will opt out and have another tech jump in
Actually they are all the same. Here is the wiring diagram,
The purple wire comes from the ignition switch and I believe the ignition switch is fed from the light switch. At the bottom of the steering column under the dash, that should be where the harness for the ignition switch comes out. Either back probe that purple wire there or disconnect the harness there and check the purple wire coming down from the steering wheel for voltage when the key is turned to start.
My mistake, I believe the ignition switch is actually fed from the horn relay, which is spliced into the connection at the B+ at the rear of the alternator. I would start testing there, at the rear of the alternator with a voltmeter or 12 volt test light, then test at the horn relay where the 2 red wires are, before having to test at that ignition switch.
Here, I made you a simplified wiring diagram of that starting system from the battery all the way to the starter.
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