Whine through stock radio

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January 8th, 2014, 5:18 PM

vwfye

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Whine through stock radio

Hey all, on the AM side of my 1989 scottsdale 's stock radio. I get a harsh rpm related whine. Is there a diode or such that is failing or was this par for the course on the delco units? Thanks!

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January 12th, 2014, 10:21 PM

namu mac

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That is an audio tachometer

More likely it is the rfi suppressor on the alternator. A little condenser mounted on the back of the alternator.

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January 23rd, 2014, 1:53 PM

vwfye

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thank you

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January 23rd, 2014, 9:10 PM

namu mac

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Did that fix it? If not, check plugs and make sure they are resistor also could be wrong plug wires.

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