i have replaced the combo switch that has the high beams turn signals and wipers. wipers work nothing else does.also replaced the headlight switch. wires look all fine. fuse for high beams blows as soon as you plug it in. anyone know where a suspect short could be? also the relays in the center box behind the stereo above the gas pedal, get so hot you cant hold them. even when the truck is off they are hot. any ideas?