I just picked up a used 372 XPG for $50.00 the cylinder is good the piston was missing...the saw is otherwise complete and cosmetically in very good condition......My question is........it has heated handles. The top hand has a red wire and a black wire coming out of the handle. The red wire is plugged in....the black wire is just hanging....does any one know where this black wire goes? Any help would be of great help.. THANKS!!