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 339 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

75.

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

NOTE

With positive lead on circuit 36G-DG, check ground with

negative lead for steps 4 thru 8.

4.

Remove circuit breaker

bracket far enough to

access relay RY-3 and

relay connector (para

3-114), and go to step

5.

5.

Remove relay RY-3 (para

3-112), and go to step

6.

6.

Check for voltage at

12-volts dc

Go to step 7.

Clean and

circuit 99Z-BK ground

nominal.

tighten ground

point.

connection.

Install relay

RY-3, relay

connector, and

circuit breaker

bracket (para

3-112 and

2-214