Crackling in speakers at 50+ mph

89wayne89wayne Member Posts: 1
edited February 2016 in GMC
Have a crackeling in my speakers when i get to 50 mph. It does it when radio is off or on. Want to know where the location of the grounds are specifically for the fuse box on the drivers dash side and for the amps. Cab grounds would be good too. I have the schematics but it is not in detail. This is a Duramax truck thanks this is a duramax truck thanksgreat
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