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 305 of 926
TM 9-2320-283-20-1
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
58 BOTH REVERSE LAMPS NOT WORKING (Continued).
10 Check for voltage at
12-volts dc
Remove jumper
Repair circuit
circuit 38B-OR ter-
nominal
wire, install
38B-OR (para
minal of connector
circuit 38B-OR
3-127)
Install
to 38C-OR, and
circuit breaker
go to step 11
bracket (para
3-114).
11 Remove relay RY-7
(para 3-112), and go
to step 12.
12 Check for voltage at
12-volts dc
Install relay
Repair circuit
circuit 38C-BR ter-
nominal
RY-7 (para
38C-OR (para
minal of relay RY-7
3-112), and go
3-127)
Install
to step 13
relay RY-7
(para 3-112).
Install circuit
breaker bracket
(para 3-114).
13 Move blackout toggle
Clicking
Install circuit
Replace relay
switch from NORMAL to
sound at
breaker bracket
RY-7 (para
BLACKOUT and back to
’relay RY-7
(para 3-114),
3-112)
Install
NORMAL position
and go to step
circuit breaker
14
bracket (para
3-114).
14 Disconnect circuit
38E-OR from 38D-OR at
connector, and go to
step 15.
15 Check for voltage at
12-volts dc
Go to step 16
Repair circuit
circuit 38D-OR ter-
nominal
38D-OR (para
minal of connector
3-127).
16 Remove taillamp cover
(para 3-96), and go to
step 17.
17 Check for voltage at
12-volts dc
Reverse lamp
Repair circuit
circuit 38G-OR ter-
nominal
circuit OK
38E-OR (para
minal of lamp
3-127).
2-180
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