TM 10-3930-659-20 16-17.    HEATER RESISTOR AND DEFROSTER RESISTOR REPLACEMENT (Con't). 5. Install defroster resistor (2) on plate (1) with two screws (4). 6. Install three leads (3) on defroster resistor (2). FOLLOW-ON TASKS: • Close cab fresh air filter door (see TM 10-3930-659-10). TA707019 16-59