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 303 of 926

TM 9-2320-283-20-1

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

58 BOTH REVERSE LAMPS NOT WORKING.

1

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-3 (para 3-114), and

go to step 2

NOTE

Ignition switch must be on, battery power connected,

transmission shift control lever in reverse (R), and

blackout toggle switch in NORMAL position when doing

the following checks.

2

Check for voltage at

12-volts dc

Go to step 3

Reset circuit

circuit 38-LG terminal

nominal

breaker CB-3

of circuit breaker

and/or trouble-

CB-3

shoot CB-3 cir-

cuit.

(Refer

to malfunction

33).

3

Disconnect circuit

38-LG from 38A-LG at

connector, and go to

step 4.

4

Check for voltage at

12-volts dc

Go to step 5

Repair circuit

circuit 38-LG terminal

nominal

38-LG (para

of connector

3-127).

Install

circuit breaker

bracket (para

3-114).

5

Connect jumper wire

from circuit 38-LG to

38A-LG, and go to step

6.

6

Access reverse switch,

and disconnect circuit

38A-LG from switch

(para 3-106).

2-178