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 357 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
79.
BOTH 24-VOLT TRAILER TAILLAMPS NOT WORKING.
NOTE
•
Headlamp switch must be in ON position and blackout
toggle switch must be set to NORMAL position when doing
the following check.
•
It is assumed here that chassis tail lamps are OK.
•
Do steps 1 thru 22 when troubleshooting 24-volt cab
connector.
•
Do steps 1 thru 20 and steps 23 and 24 when
troubleshooting 24-volt chassis connector.
1.
Check for voltage at
12-volts dc
Go to step 2.
Repair circuit
circuit 30N-BR terminal
nominal.
30N-BR (para
of clearance lamp
3-127).
switch.
2.
Remove circuit breaker
bracket far enough to
access relay RY-6 and
relay connector (para
3-114), and go to step
3.
3.
Remove RY-6 (para 3-112),
and go to step 4.
4.
Check for voltage at
12-volts dc
Go to step 5.
Repair circuit
circuit 30P-BR terminal
nominal.
30P-BR (para
of relay RY-6.
3-127).
Install
relay RY-6,
relay connec-
tor, and cir-
cuit breaker
bracket (para
3-112 and
3-114).
2-232
Back to Top
