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....Okay...I give up....I throw in the towel....I'm beat and can't figure out how to kill the alternator whine noise in my stereo system in my '78 F150. It wasn't there with my previous cheapy Jensen cassette stereo. I have already exhausted every avenue via the FTE Audio Forum, except changing the RCA cables to another brand or changing my custom Taylor 9mm plug wires back to stock. So now, I'm asking for any help from you local audio experts. Would anybody be interested in coming over to help me troubleshoot this to figure out what I need to change/correct? I'm up in Owasso. I know we're not supposed to do any tech talk here, so I'm using this opportunity to ask for some local members to come over to help me figure this out. I can offer lunch and a cold drink if that would make it worth your while?.
I think the part you are looking for is the capacitor or a noise suppressor (it is round, about 3/4 inch in diameter, and one wire attaching to it in the center), one is mounted by the coil and hooked up to the wire coming out of the coil, the other is mounted next to the voltage regulator. Take a look and see if your truck has either.
Word of advice "Take your time, clean and prep part, and don't cut corners"
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