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 410 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11. TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

NOTE

With positive lead on circuit 21BPP, check ground with negative lead

when doing the following checks.

3.

Check for ground at

12-volts dc

Replace work-

Repair circuit

circuit 99D-BK terminal

nominal.

lamp receptacle

99D-BK (para

of utility outlet

(para 3-132).

3-127).

receptacle.

90.

BOTH UTILITY OUTLET RECEPTACLES NOT WORKING.

1.

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-6 (para 3-114), and

go to step 2.

2.

Check for voltage at

12-volts dc

Install circuit

Reset circuit

circuit 21-PP terminal

nominal.

breaker bracket

breaker CB-6

of circuit breaker

(para 3-114),

and/or trouble-

CB-6.

and go to step

shoot CB-6

3.

circuit.

(Refer

to malfunction

34).

3.

Disconnect circuit

21-PP from 21A-PP

(located behind instru-

ment gages), and go to

step 4.

4.

Check for voltage at

12-volts dc

Connect circuit

Repair circuit

circuit 21-PP terminal

nominal.

21-PP to

21-PP (para

of connector.

21A-PP, and go

3-127).

to step 5.

2-284