I just got my truck back from getting a new timing chain and head gasket (thanks Pat Decook) and, like a dumbass, tried to pull my bare speaker wires through the holes in the rear floor hot which seems to have shorted them. Now when the inputs are plugged in, the speakers make a whining sound that increases with the sound of the engine. Doesnt do it when the inputs are unplugged. I would guess its a ground issue if it didnt happen as soon as I did that. The protect light isnt on and it still works, just sounds like shit when the volume is low. The amp is a Kicker ZR120 from the mid 90's. Any ideas?