TM 10-3930-659-20 6-16. LEFT PANEL WIRING HARNESS MAINTENANCE (Con’t). 3. Disconnect   three   heater   resistor   leads   (6) from heater resistor (5). 4. Disconnect three defroster resistor leads (7) from defroster resistor (8). 5. Remove   nut   (10),   lockwasher   (11),   screw (12),  washer  (13),  and  cab  ground  terminal lead (14) from cab (9).  Discard lockwasher. 6-65