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 341 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).
7.
Remove relay RY-2
(para 3-112), and go
to step 8.
8.
Check for voltage at
12-volts dc
Go to step 9.
Repair circuit
circuit 99Z-BK ter-
nominal.
99Z-BK (para
minal of relay RY-2.
3-127).
Install
relays RY-2 and
RY-3, relay
connector, and
circuit breaker
bracket (para
3-112 and
3-114).
9.
Check for voltage at
24-volts dc
Go to step 10.
Reset circuit
circuit 18A-TN
nominal.
Breaker CB-8
terminal of circuit
and/or trouble
breaker CB-8.
Shoot CB-8 cir
cuit.
(Refer
to malfunction
35).
10.
Check for voltage at
24-volts dc
Install relays
Repair circuit
circuit 18A-TN ter
nominal.
Ry-2 and RY-3,
18A-TN (para
minal of relay connec
relay connec
3-127).
Install
tor.
Tor, and cir
relaya RY-2 and
cuit breaker
RY-3, relay
bracket (para
connector, and
3-112 and
circuit breaker
3-114).
Recheck
bracket (para
trailer cir
3-112 and
cuit.
3-114).
2-216
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