Bill Harz and Bobby Ouellette remove the furnace.

With the furnace removed, cover plates are bent to expose interior circuitry that required testing to determine which component was inoperative.

Bobby uses power from his car for troubleshooting the furnace's circuit board and permissive switches.

The circuit board on the bottom of the picture was removed and taken to Adam's RV in Santa Barbara Diagnostic testing  revealed damage to the circuit board.