1998 Pete 379 - I have a switch on the dash that has a 704 and 298 wire. When the switch is activated, you can hear a clicking noise (relay) inside the dash. When you click the switch to the off position, same noise. know the 298 is coming from the breaker circuit, and for the life of me, WE (Peterbuilt store) cannot find 704 on the Wiring Schematic. The switch is surely a factory plug hooked up, but what is it operating?