sounds like a broken wire where the body & door meet broken wires on one circuit cn cause feedback and affect other circuits ,sounds like this is happening to yours ,you will need to remove the rubber shroud and seperate the wires then lightly pull each wire seperatly ,when you find the wire with the broken core the plastic outer sheathing will ''stretch'' at the point of the break it will then need soldering and then insulating
bob k, August 2009
