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Old 06-15-2010, 06:16 PM
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Join Date: May 2010
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Default Radio noise

90 c1500 all original, the original radio is picking up engine noise- whinning noise, it practacally went away when the alternator went out, is there a noise filter somewhere that has gone bad? It's a new toy to me and not sure how long it has been doing it.
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Old 06-15-2010, 09:33 PM
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sounds like a bad ground problem.....alternator whine is always a bad ground.....without getting technical about it.basiclly the radio or the alternator is trying to find a ground....The problem is usually found in the chassis ground straps
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Old 06-16-2010, 07:02 AM
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Those amplifiers in the late 80's to mid 90's trucks go bad and will make that noise. They are pricey if you can even find a good one. The best way to fix it is put in an aftermarket radio - unfortunately.
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