I have a high pitched buzz in my 89 Chevy pick-up radio speakers. It
rises and falls with the engine rpms. I had the alternator rebuilt a
while back but it didn't make any difference. Is there a suppressor
in the alternator that the mechanic could have missed? Could it be
something in the radio that is getting old and quit working?
It is not horribly bad, just an annoying high frequency whine. Even
though I was married for 23 years, but I can't tolerate as much
whining as I used to.
I can hear it on both AM and FM, and I can hear it even when the
volume is turned all the way down. The buzz doesn't get quieter if I
turn the radio down. Yes, I use AC CR43TS plugs and they are pretty
new. I wonder if one went bad...
If you're hearing a whining sound it's the alternator. If it's a snapping
sound it's a plug or plug wire. I think it's alternator whine. Ignition
noise would go up and down with the volume control. Find a capacitor from an
old points type ignition system and put the thin wire on the big fat wire
coming from the alternator and ground the case under a clean screw.
(Preferably on the alternator) That should help.
If the radio is not stock and was installed by some one. Hook the radios
positive wire(s) directly to the positive battery termal, if the noise
goes away then you can simply find a different positive connection at the
fuse box. Also if you have an amp you must do the same test.
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