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 279 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
49.
ALL CAB CLEARANCE AND MARKER LAMPS NOT WORKING.
NOTE
Blackout toggle switch must be set to NORMAL position and headlamp switch in
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
circuit 30R-BR terminal
nominal.
blackout toggle
of blackout toggle
switch (para
switch.
3-79).
4.
Check for voltage at
12-volts dc
Go to step 5.
Repair circuit
circuit 30N-BR terminal
nominal.
30N-BR and/or
of clearance lamp
30R-BR (para
switch.
3-127).
5.
Check for voltage at
12-volts dc
Go to step 6.
Replace
circuit 31-BR terminal
nominal.
clearance lamp
of clearance lamp
switch (para
switch.
3-93).
6.
Remove four to six
screws at upper left
corner of cab headliner
to access connector,
and go to step 7.
2-154
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