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 309 of 926
TM 9-2320-283-20-1
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
60.
BLACKOUT HEADLAMP NOT WORKING.
NOTE
Headlamp switch must be in ON position and blackout
toggle switch set to BLACKOUT position when doing the
following checks.
1
Check for voltage at
12-volts dc
Go to step 2
Refer to mal-
circuit 26-GY terminal
nominal
function 44.
of headlamp switch.
2
Check for voltage at
12-volts dc
Go to step 3
Repair circuit
circuit 26-GY terminal
nominal
26-GY (para
of blackout toggle
3-127).
switch.
3
Check for voltage at
12-volts dc
Go to step 4
Replace black-
circuit 19-LB terminal
nominal
out toggle
of blackout toggle
switch (para
switch.
3-79).
4
Disconnect circuit
19-LB from 19A-LB at
connector, and go to
step 5.
5
Check for voltage at
12-volts dc
Connect circuit
Repair circuit
circuit 19-LB (pin E
nominal
19-LB to 19A-LB,
19-LB (para
of connector)
and go to step
3-127).
6.
6
Disconnect circuit
19A-LB from 19B-LB at
connector, and go to
step 7.
7
Check for voltage at
12-volts dc
Connect circuit
Repair circuit
circuit 19A-LB terminal
nominal
19A-LB to
19A-LB (para
of connector
19B-LB, and go
3-127).
to step 8.
2-184
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