bigrob830
+1y
yeah sounds like a ground problem. first make sure your radio has a good ground some times the one on the radio harness (truck side) aren't that great, reground it to some support steel in the dash. also are you using a amp for your 6 1/2 and 6x9s? if so check that ground also make sure where ever you have it grounded you scrape off the paint, to get to bare metal.dont ground to a existing floor bolt cause they are not always good spot. They will get a ground but not the cleanest. If you are using a amp try grounding the RCA cables, this also works for engine-wine noise aka alternater whine. well hope you fix the problem.