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 376 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).
13
Move blackout toggle
Listen for
Install relay
Replace relay
switch from BLACKOUT
clicking
connector and
RY-4
Install
to NORMAL and back to
sounds at
circuit breaker
relay connector
BLACKOUT position relay RY-4
bracket (para
and circuit
3-112 and
breaker
bracket
3-114), and go
(para
3-112
and
to step 14
3-114).
14
Disconnect circuit
24F-RD from 24E-RD at
connector, and go to
step 15.
15
Check for voltage at 24-volts dc
Connect circuit
Repair circuit
circuit 24E-RD (pin H
nominal
24F-RD to
24E-RD (para
of connector)
24E-RD, and
3-127).
go to step 16.
16
Disconnect 24-volt cab
connector, and go to
step 17.
17
Check for voltage at 24-volts dc
Recheck 24-volt
Repair circuit
circuit 24G-RD (pin F
nominal
trailer black-
24G-RD and/or
of connector)
out stoplamp
24F-RD (para
circuit
3-127).
18
Disconnect 24-volt
chassis connector,
and go to step 19.
2-250
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