TM 9-2320-209-20-3-1 4-13. MANIFOLD HEATER (TOP-MOUNTED, UNCOVERED) IGNITION UNIT REMOVAL AND REPLACEMENT. TOOLS: l/2-inch wrench 7/8-inch wrench Pliers SUPPLIES : None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off and cold, handbrake set. a. Preliminary Procedures. (1) Open hood. Refer to TM 9-2320-209-10. (2) Disconnect battery ground cable. Refer to para 7-58. b. Removal. FRAME 1 I 1. Using 7/8-inch wrench, unscrew and take off electrical cable connector (1) from ignition unit (2). 2. Using pliers, unscrew and take off electrical cable connector (3) from ignition unit (2). 3. Using l/2-inch wrench , unscrew and take out two screws with washers ( 4). 4. Slide off two clamps (5) from ignition unit (2). 5. Take out ignition unit (2). END OF TASK TA 083342 4-73