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 317 of 926

TM 9-2320-283-20-1

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

63 BOTH BLACKOUT STOPLAMPS NOT WORKING.

1

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-1 (para 3-114), and

go to step 2.

2

Check for voltage at

12-volts dc

Go to step 3

Reset circuit

circuit 25-OR terminal

nominal

breaker CB-1

of circuit breaker

and/or trouble-

CB-1

shoot CB-1 cir-

cuit.

(Refer to

malfunction

33).

3

Disconnect circuit

25-OR from 25A-OR at

connector, and go to

step 4.

4

Check for voltage at

12-volts dc

Go to step 5

Repair circuit

circuit 25-OR terminal

nominal

25-OR (para

of connector

3-127).

Install

circuit breaker

bracket (para

3-114).

5

Connect jumper wire

between 25-OR and

25A-OR, and go to step

6.

6

Check for voltage at

12-volts dc

Go to step 7

Repair circuit

circuit 25A-OR terminal

nominal

25A-OR (para

of stoplamp switch

3-127).

Remove

jumper and con-

nect circuit

25-OR to 25A-

OR.

Install

circuit breaker

bracket (para

3-114).

2-192