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 374 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

80.

BOTH 24-VOLT TRAILER BLACKOUT STOPLAMPS NOT WORKING (Continued).

10

Check for voltage at 12-volts dc

Go to step 11

Repair circuit

circuit 99X-BK ter-

nominal

99X-BK (para

minal of relay con-

3-127) Install

nector

relay RY-4,

relay connec-

tor, and cir-

cuit breaker

bracket (para

3-112 and

3-114).

11

Check for voltage at 24-volts dc

Go to step 12

Reset circuit

circuit 18B-GY ter-

nominal

breaker CB-9

minal of circuit

and/or trouble-

breaker CB-g

circuit (Refer

shoot CB-9

to malfunction

35).

12

Check for voltage at 24-volts dc

Install relay

Repair circuit

circuit 18B-GY termi-nominal

RY-4, and go to

18B-GY (para

nal of relay RY-4

step 13

3-127)

Install

relay connec-

tor, and cir-

cuit breaker

bracket (para

3-112 and

3-114).

2-248