TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 271 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

47.

ONE FRONT MARKER LAMP NOT WORKING (FRONT TURN SIGNAL LAMP OK).

NOTE

• Set blackout toggle switch to NORMAL position and headlamp switch

to ON position when doing the following checks.

• Faulty right marker lamp is shown in this procedure. Apply similar

troubleshooting technique for left marker lamp.

1.

Disconnect circuit

30C-BR from 30D-BR at

connector, and go to

step 2.

2.

Check for voltage at

12-volts dc

Connect cir-

Repair circuit

30C-BR terminal of

nominal.

cult 30C-BR

30C-BR (para

connector.

to 30D-BR,

3-127).

and go to

step 3.

3.

Remove headlamp

assembly (para 3-91),

and go to step 4.

4.

Check for voltage at

12-volts dc

Go to step 5.

Repair circuit

circuit 30D-BR of

nominal.

30D-BR (para

junction block.

3-127). Install

headlamp assem-

bly (para

3-91).

5.

Remove marker lamp bulb

(para 3-92), and go to

step 6.

2-146