why do I hear electric feedback on the radio of my truck?

Answer 1

You probably need to check the connections to the radio. More than likely your power or ground (red or black) connections aren't all that great. You may want to get some nice wire splicing devices to help with the issue if your current connections are just crappy taped ones.

Or, your engine may be too friggin huge. Or your alternator could be giving you an inconsistant power source which would cause the same thing to happen.

Answer 2

Could be bad ignition wires. But if it isn't that rapid-fire pop pop pop, it might be the alternator telling you that it is failing.
Disconnect the main wire to the alternator, and if it goes away, re-connect the wire. Start the truck and let it idle. Put a volt-meter set on A/C volts across the battery. If you read anymore than 1/4 Volts A/C, the diode bridge inside is failing. Replace it.

Good Luck

Answer 3

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Answer 4

Its a bad ground or a bad ignition wire. A defective alternator will do it also.