TM 9-2320-209-20-3-4 23-22. BATTERY BOX HEATER PAD REPAIR. NOTE Repair of battery box heater pad is limited to putting a new battery box heater pad in place of a damaged one. TOOLS: Flat-tip screwdriver 1-gallon container SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off and cool, handbrake set. a. Preliminary Procedures. (1) Remove batteries. Refer to Part 1, para 7-56. (2) Open hood and right side panel. Refer to TM 9-2320-209-10. WARNING Do not work on cooling system components until cool. Personnel can be badly burned by hot components. NOTE Make sure powerplant heater is off and cool. 23-64