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 269 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
46.
BOTH FRONT MARKER LAMPS NOT WORKING (FRONT TURN SIGNAL LAMPS OK).
NOTE
Blackout toggle switch must be set to NORMAL position and
headlamp switch must be set to ON position when doing the
following checks.
1.
Check for voltage at
12-volts dc
Go to step 2.
Refer to mal-
circuit 30-OR terminal
nominal.
function 44.
of headlamp switch.
2.
Check for voltage at
12-volts dc
Go to step 3.
Repair circuit
circuit 30-OR terminal
nominal.
30-OR (para
of blackout toggle
3-127).
switch.
3.
Check for voltage at
12-volts dc
Go to step 4.
Replace black-
circuit 30R-BR of
nominal.
out toggle
blackout toggle switch.
switch (para
4.
Disconnect circuit
30A-BR from 30B-BR of
connector, and go to
step 6.
5.
Check for voltage at
12-volts dc
Connect cir-
Repair circuit
circuit 30A-BR (pin B
nominal.
cult 30A-BR
30A-BR and/or
of connector).
to 30B-BR,
30R-BR (para
and go to
3-127).
step 6.
2-144
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