TM10-3930-660-20 8-48. BOOM ELECTRICAL CABLE -  TEST/REPLACE/REPAIR This task covers: a. Testing b. Removal C.  Repair d. Installation Initial Setup Tools Materials/Parts Tool Kit, Automotive Mechanics Electrical Tape Lockwashers (16) (23) (27) (31) Test Equipment Rope, 25 ft. Ohmmeter Tie  Straps  (13)  (34) Equipment  Condition Personnel  Required Vehicle parked on level ground. Two Personnel Load backrest removed from MLRS attachment (if stored), TM10-3930- 660-10. TESTING Failure of an electrical device to function is more likely due to a faulty switch (actuator),or to a faulty device itself, than to a broken wire in wiring harness. Do not assume that a broken wire exists until related electrical device and actuator have been checked. 1. INSPECT WIRES FOR POOR CONNECTIONS AT TERMINALS, CUTS OR OTHER DEFECTS. 2. CHECK CONTINUITY OF SUSPECTED WIRES TO DETERMINE IF HIDDEN BREAKS EXIST. a. Use electrical schematic to locate both terminals of suspected wire. 8-144