Wiring mess 70 cougar

Can never get everything working at the same time I’ve had the signal lights dash lights horn everything working stereo all working but never at the same time and tonight‘s when I turn on the lights the amp light would come on. I don’t know I’m sick of it.

sometimes the basic is the answer. Seems like you may have a grounding issue. Start by checking the engine to body ground wire found at years of motor to firewall. Find out the voltage at the battery b4 starting & while running. report back please.

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