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 177 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

20 STARTER FAILS TO OPERATE (Continued).

3

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-8 (para 3-114), and

go to step 4.

4

Check for voltage at

24-volts dc

Go to step 5

Repair circuit

circuit 18-YL terminal

nominal

18-YL (para

of circuit breaker

3-127).

Install

CB-8

circuit breaker

bracket (para

3-114).

5

Check for voltage at

24-volts dc

Install circuit

Repair circuit

circuit 18F-YL terminal

nominal

breaker bracket

18F-YL and/or

of ignition switch

(para 3-114),

clean and

and go to step

tighten connections

6

at circuit

breakers

CB-8 and CB-9.

Install circuit

breaker bracket

(para 3-114).

6

Check for voltage at

24-volts dc

Go to step 7

Replace switch

circuit 12A-DB terminal

nominal

(para 3-74).

of ignition switch.

7

Check for voltage at

circuit 47-DB terminal

24-volts dc

Go to step 8

Repair circuit

of neutral safety

nominal

47-DB and/or

switch

12A-DB (para

3-127).

2-52