BLACKOUT DRIVE LIGHT(S) DO NOT OPERATE - continued

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) 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

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