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 404 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11. TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

85.

BOTH MAP LAMPS NOT WORKING.

NOTE

Blackout toggle switch must be set to NORMAL position and map lamp

switch set to ON position when doing the following checks.

Refer to malfunction 84,

step 3.

86.

ONE MAP LAMP NOT WORKING.

NOTE

•

Blackout toggle switch must be set to NORMAL position and map

lamp switch set to ON position when doing the following checks.

•

Faulty driver’s map lamp is shown in this procedure.

Apply similar

troubleshooting technique for passenger’s map lamp.

1.

Remove driver’s map

lamp (para 3-99).

2

Check for voltage at

12-volts dc

Replace bulb

Repair circuit

circuit 15A-YL terminal

nominal.

(para 3-99).

1SA-YL (para

of connector.

3-127).

2-278