that is strange. Try disconnecting the rca's and see if it still does it. If you have a volt meter check each of the wires to make sure they read what they should. Yellow = 12v constant, red = 12v switched, orange = dimmer 8-12v, and also check to make sure that the ground wire goes through the hrns and has a factory wire on the other side. There was a ground clip shown in one of the pics and if you do not have the deck grounded it could be seeking ground through the ant which is probably what is happening.