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 370 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).

4

Check for voltage at 12-volts dc

Go to step 5

Repair circuit

circuit 24D-PK terminal

nominal

924D-PK

(para

of relay connector

3-127) Install

relay RY-4,

relay connec-

tor, and

circuit breaker

bracket (para

3-112 and

3-114).

NOTE

With positive lead on circuit 24D-PK, check ground with negative lead for steps 5 thru

10.

5

Check for voltage at 12-volts dc

Go to step 6

Clean and

circuit 99Z-BK ground

nominal

tighten

ground

point

point connec-

tion Install

relay RY-4,

relay connec-

tor, and cir-

cuit breaker

bracket (para

3-112 and

3-114).

2-244