Make sure the antenna base is well grounded.Most noises enter via the antenna on weak AM stations near the low frequency end of the band.GM makes a good noise suppression filter.Part #1224205 for alternator whine and it goes in the positive line to the radio.For heater fan motor noise you can use PN #3906145 in line to the blower motor.A PN 3861562 for turn signal flasher pop.Check your grounds first.Hope this helps.


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Must be able to cook , clean , sew , tune engines and polish trucks. Must have old Stovebolt and garage. Please send picture of old Stovebolt and garage.