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 349 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
76.
ONE 24-VOLT TRAILER STOPLAMP NOT WORKING (Continued).
12.
Remove relay RY-2
(para 3-112), and go
to step 13.
13.
Check for voltage at
24-volts dc
Go to step 14.
Repair circuit
circuit 18A-TN ter-
nominal.
18A-TN (para
minal of relay RY-2.
3-127).
14.
Check for voltage at
24-volts dc
Go to step 15.
Repair circuit
circuit 18D-TN ter-
nominal.
18D-TN (para
minal of relay RY-3.
3-127).
Install
relay RY-3 and
relay connector
(para 3-112 and
3-114).
15.
Install relay RY-3
(para 3-112), and go
to step 16.
16.
Move blackout toggle
Listen for
Install relay
Replace relay
switch from NORMAL to
clicking
RY-3, relay
RY-3.
Install
BLACKOUT and back to
sound at
connector, and
relay connector
NORMAL position.
RY-3.
circuit breaker
and circuit
bracket (para
breaker bracket
3-112 and
(para 3-112 and
3-114), and go
3-114).
to step 17.
17.
Disconnect circuit
34-LG from 34A-LG,
and go to step 18.
2-224
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