TM 9-2320-209-20-3-4 c. Replacement. FRAME 1 1. Using screwdriver, screw in and tighten two screws (1) with two wires (2) as tagged on heater motor resistor (3). Take off tags. 2. Put heater motor resistor (3) on fire wall (4) and aline screw holes. 3. Using screwdriver, screw in and tighten two screws (5). NOTE Follow-on Maintenance Action Required: Reconnect battery ground cable. Refer to Part 1, para 7-58. END OF TASK 23-55