need power and plug in car antena into it, and lead into radio. if you still have a factory radio, will need to also buy an antenna adapter, like metra 40-GM10

 

wow pat ur up late

 

yes,the sound is coming from the alternator.how do i fix it

 

my guess is that you have something up with your wiring. the correct thing to do in the long run is check all the wiring . but you can buy a noise blocker. try crutchfield.com

 

or if you don't want to pay an arm and a leg for it, try this site.

 

why is that only the aftermarket radio does this? I plug in my alpine deck and it then starts of course only when the engine is running.

 

just a little more interference. little more power. basically,. its your trucks way of saying I hate you.

 

lol

 

so even though the am reception is perfect /w both the factory and aftermarket alpine /w the engine off and terrible only /w the alpine /w and the engine on, a antenna booster will help this?

 

yes, you are picking up interference through your electrical system.