TM 10-3930-659-20 16-17.    HEATER RESISTOR AND DEFROSTER RESISTOR REPLACEMENT. This Task Covers: a. Removal b. Installation Initial Setup: Equipment Conditions: Materials/Parts: • Battery disconnect switch in OFF position (see •  Marker tags (Item 33, Appendix C) TM 10-3930-659-10). • Cab fresh air filter door opened (see TM 10-3930- References: 659-10). •  TM 10-3930-659-10 Tools/Test Equipment: • General mechanic's tool kit (Item 44, Appendix F) a. REMOVAL NOTE All   leads   should   be   tagged   before   removal.      Refer   to   paragraph   2-18   for   tagging instructions. 1. Remove three leads (3) from defroster resistor (2). 2. Remove two screws (4) and defroster resistor (2) from plate (1). TA707017 16-57