TM 9-2320-209-34-2-1 7-8. CHASSIS WIRING HARNESS REMOVAL AND REPLACEMENT (TRUCKS M275A1 AND M275A2). TOOLS: No special tools required SUPPLIES: Tags PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Open hood and side panels. Refer to TM 9-2320-209-10. (2) Disconnect battery ground. Refer to TM 9-2320-209-20. (3) Disconnect speedometer cable. Refer to TM 9-2320-209-20. (4) Disconnect tachometer cable. Refer to TM 9-2320-209-20. 7-17