do you have the stock radio in the truck? sounds like you may have a wire switched. i would go back and double check everything make sure you have a solid ground.
and this is a little off topic but...i have 2 12"s in my regular cab truck. it is amazing to go down the road with them thumping its like a back message. and the cops dont expect a truck to have subs in so they look for something else when they hear it.
bikerboy