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 365 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 (Continued).
17
Install relay RY-6,
and go to step 18.
18
Set blackout toggle Listen for
Install relay
Replace relay
switch from NORMAL to
clicking
RY-6, relay
RY-6, and
BLACKOUT then back to
sound at
connector, and
install relay
NORMAL position
relay RY-6
circuit breaker
connector and
bracket (para
circuit breaker
3-112 and
bracket (para
114), and go
3-112 and
to step 19
3-114).
19
Disconnect circuit
70A-BK from 70-BK at
connector, and go to
step 20.
20
Check for voltage at 24-volts dc
Connect circuit
Repair circuit
circuit 70-BK (pin K nominal
7OA-BK to
70-BK (para
of connector)
70-BK, and go
3-127).
to step 21 or
22.
21
Disconnect 24-volt
cab connector, and go
to step 22.
22
Check for voltage at 24-volts dc
Recheck trailer
Repair circuit
circuit 70B-BK (pin E nominal
taillamp cir-
70A-BK and/or
of connector)
cuit
70B-BK (para
3-127)
23
Disconnect 24-volt
chassis connector,
and go to step 24.
24
Check for voltag e at 24-volts dc
Recheck trailer
Repair circuit
circuit 70C-BK (pin Enominal
taillamp cir-
70A-BK and/or
of connector)
cuit
70C-BK (para
3-127)
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