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 347 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

76.

ONE 24-VOLT TRAILER STOPLAMP NOT WORKING (Continued).

8

Remove relay RY-2

(para 3-112), and go

to step 9.

9

Check for voltage at

12-volts dc

Go to step 10

Repair circuit

circuit 99Z-BK ter-

nominal

99Z-BK (para

minal of relay con-

3-127)

Install

nector

relays RY-2 and

RY-3, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

10

Check for voltage at

12-volts dc

Go to step 11

Repair circuit

circuit 99Y-BK ter-

nominal

99Y-BK (para

minal of relay con-

3-127) Install

nector

relays RY-2 and

RY-3, relay

connector, and

circuit breaker

bracket (para

3-112 and

3-114).

11

Check for voltage at

24-volts dc

Go to step 12

Reset circuit

circuit 18A-TN ter-

nominal

breaker CB-8

minal of circuit

and/or trouble-

breaker CB-8

shoot CB-8

circuit (Refer

to malfunction

35).

2-222