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The fuel pump can be a major source of noise. The heater a/c blower and wiper motor too. The dc brush motors are noisy because of the commutator and it uses the vehicle wiring as the antenna. Shunting the rf to ground right at the motor would probably help. Something like a 0.01 micro farad ceramic disc capacitor across the wires in the plug would be a good start. Also grounding the radio to the body of the truck can pick up noise if a noisy device uses the same path in the body to the battery negative.

[QUOTE="Shadetree Mechanic, post: 752712, member: 50927"] The fuel pump can be a major source of noise. The heater a/c blower and wiper motor too. The dc brush motors are noisy because of the commutator and it uses the vehicle wiring as the antenna. Shunting the rf to ground right at the motor would probably help. Something like a 0.01 micro farad ceramic disc capacitor across the wires in the plug would be a good start. Also grounding the radio to the body of the truck can pick up noise if a noisy device uses the same path in the body to the battery negative. [/QUOTE]

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