96 GMC Sierra A/C goes on and off with pressed brake pedal

steve56

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Yeah, I know it sounds weird. The AC/Heater works intermittently. It will go off(blower motor and compressor) when I push the brake pedal. The ABS light comes on when the blower/compressor goes off. It will come back on when the ABS light goes back off. I can manipulate this process by kicking the brake pedal with my foot or pushing the brake pedal(this doesnt help consistently though.) I can also manipulate the blower motor to come on by playing with the wiring harness above the brake pedal with hand ..with the ignition off! Obviously something to do with the wiring in that area. Had the brake switch replaced...no change. No one seems to know what to do except suggesting replacing wiring harnesses. Seems like overkill to me. I'm thinking a compromised ground somewhere but don't know where to look. Does anybody have any ideas? Thanks
 


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