TM 10-3930-659-20 16-17.    HEATER RESISTOR AND DEFROSTER RESISTOR REPLACEMENT (Con't). 3. Remove three leads (7) from heater resistor (6). 4. Remove two screws (8) and heater resistor (6) from plate (1). 5. If plate (1) is damaged, remove two screws (9), washers (10), plate, and isolator (5) from heater housing (11). b. INSTALLATION NOTE Perform steps 1 and 2 only If plate was removed. 1. Apply adhesive (Item 1, Appendix C) to isolator (5) and install Isolator on plate (1). 2. Install plate (1) on heater housing (11) with two washers (10) and screws (9). 3. Install heater resistor (6) on plate (1) with two screws (8). 4. Install three leads (7) on heater resistor (6). TA707018 16-58