TM10-3930-660-20 8-48. BOOM ELECTRICAL CABLE - TEST/REPLACE/REPAIR  (Cont’d) 15. REMOVE ELECTRICAL CABLE (12) FROM INSIDE  BOOM. a. Carefully pull cable (12) at rear of boom until rope appears. b. Carefully pull cable (12) through access hole (a) at hose tensioner (21)  until  rope  appears. c. Untie rope end from cable (12) and tie rope end to hose tensioner assembly  (21). REPAIR If 30 percent or more of the wires in a wiring harness have been repaired or replaced, replace complete harness. 1. REPLACE ANY BROKEN TERMINAL RINGS OR CONNECTORS. 2* REPLACE ANY FAULTY WIRES. a. b. c. d. e. f. Note both connection points of faulty wire. Disconnect faulty wire at both ends. Cut exposed wire and terminals from both ends of faulty wire. Cut replacement wire to required length and install proper terminals. Route replacement wire along wiring harness, securing wire with tie straps or electrical tape. Connect replacement wire to original connection points. Test circuit function. 8-148