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 249 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

36.

SHIFT TOWER LAMP NOT WORKING.

NOTE

Headlamp

rheostat

switch

must

be rotated fully

clockwise when doing the following checks.

1.

Check for voltage at

12-volts dc

Go to step 2.

Refer to mal-

circuit 29S-BR terminal

nominal.

function 44.

of headlamp switch.

2.

Disconnect circuit

12-volts dc

Connect cir-

Repair circuit

29S-BR from 29T-BR at

nominal.

cuit 29S-BR

29S-BR (para

connector.

Check for

to 29T-BR,

3-127).

Connect

voltage at circuit

and go to

circuit 29S-BR

29S-BR (pin k of

step 3.

to 29T-BR.

connector).

3.

Check for voltage at

12-volts dc

Go to step 4.

Repair circuit

circuit 29S-BR terminal

nominal.

29T-BR (para

of shift tower lamp.

3-127).

4.

Remove bulb from shift

12-volts dc

Replace bulb

Clean socket

tower lamp (para 3-87).

nominal.

(para 3-87).

and install

Check for voltage at

bulb (para

lamp socket.

3-87).

TA 236868

2-124