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Ever since I bought this truck (Jan '05), there has been a pulsating static on the AM side. The pulsating is at a rate of about 6 times/second. Only when I am really close to the station's transmitter - say 5 to 7 miles or so - is the static overcome by the signal strength of the station. The pulsating is constant - never changes in rate or pitch. Pulsating static stops when I turn off the engine.
Thought that if there was an external filter I'd check it out but I have no idea where to look.