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TM 10-3930-673-20-1
Remove rings bracelets watches, necklaces, and any other jewelry before working around vehicle. Jewelry can catch on
equipment and cause injury or short across electrical circuit and cause severe burns or electrical shock.
Battery acid is harmful to skin and eyes. Always wear eye protection when working with batteries.
BULB
VOLTAGE TEST
(1) Set multimeter to volts dc.
(2) Connect multimeter positive lead (+) to
center conductor of faulty socket.
SOCKET
(3) Connect multimeter negative lead () to
known good ground.
(4) Turn blackout light switch to B. O.
DRIVE position (TM 10-3930-673-10).
(5) Turn engine start switch to ON position,
BUT DO NOT START ENGINE
(TM 10-3930-673-10).
(6) Depress brake pedal
(TM 10-3930-673-10).
(a) If 24 vdc is present, go to Step 14
of this fault.
D LACKOUT
B
(b) If 24 vdc is not present, go to
RIVE LIGHT
Step 3 of this fault.
(7) Turn blackout light switch to OFF
position (TM 10-3930-673-10).
(8) Turn engine start switch to OFF
position, (TM 10-3930-673-10).
VOLTAGE TEST
(1) Remove battery covers (Para 8-42).
(2) Disconnect negative battery cable from
negative side of battery (Para 8-42).
WIRE 9
(3) Set multimeter to volts dc.
(4) Connect multimeter positive lead (+) to
the starter motor solenoid where wire 9
connects.
(5) Connect multimeter negative lead () to
known good ground.
(6) Connect negative battery cable to
negative side of battery (Para 8-42).
(a) If 24 vdc is present, go to Step 4 of
this fault.
(b) If 24 vdc is not present, service or
replace battery cable (Para 8-42).
(7) Disconnect negative battery cable from
STARTER SOLENOID
negative side of battery (Para 8-42).
TR01664
2-325

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