3-7. GENERAL MAINTENANCE PROCEDURES. (CONT)
High voltage is present on this equipment. Do not perform continuity (resistance)
tests with power on. Death or serious injury may result.
Testing for broken wires. Set multimeter to low ohms scale and zero the meter. Isolate the wire to be
tested by disconnecting at least one end. Connect the multimeter probes to each end of the wire. A
measurement of zero ohms indicates continuity (wire is unbroken). A measurement of high resistance
(infinity) indicates no continuity (wire is defective). If the wire is defective, repair or replace it in accordance
with step (5) or (6) below.
Testing for grounded wires. Set multimeter to high ohms scale and zero the meter. Isolate the wire to be
tested by disconnecting both ends. Connect the multimeter probe to frame ground, and connect remaining
probe to either end of the wire. A measurement of high resistance (infinity) indicates no continuity (wire is
not grounded). A measurement of low resistance indicates a grounded wire (wire is defective). If the wire
is defective, replace it in accordance with step (6) below.
Repair. Use electrical repair kit or shave the insulation on the wire to expose 1/2 inch (1.27 cm) of bare
wire at both ends of the break. Twist the bare wire together and solder the connection. Cover the break
with electrical friction tape. Be sure to leave no bare wire exposed. If a terminal lug breaks off a wire,
replace it with an exact duplicate.
Replacement. Replace a wire by disconnecting it from the component or components to which it is
attached and remove the wire. Connect a new wire to the component or components. If a broken wire is
part of a harness, disconnect the wire at each end and tape the loose ends with electrical tape. Install a
new wire and attach it to the outside of the wiring harness.
Bearings. For cleaning and inspection of antifriction bearings, refer to TM 9-214.