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 311 of 926
TM 9-2320-283-20-1
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
60. BLACKOUT HEADLAMP NOT WORKING (Continued).
8.
Access junction block
by removing headlamp
assembly (para 3-91),
and go to step 9.
9.
Check for voltage at
12-volts dc
Install head-
Repair circuit
circuit 19B-LB of
nominal.
lamp assembly
19B-LB (para
junction block.
(para 3-91),
3-127).
and go to step
10.
10.
Disconnect circuit
19C-LB from blackout
headlamp, and go to
step 11.
11. Check for voltage at
12-volts dc
Go to step 12. Repair circuit
circuit 19C-LB of
nominal.
19C-LB (para
connector.
3-127).
NOTE
With positive lead on circuit 19C-LB, check ground with
negative lead when doing the following checks.
12. Remove lens and bulb
from blackout headlamp
(para 3-95), and go to
step 13.
13. Check for voltage and
12-volts dc
Replace bulb
Clean socket
socket ground.
nominal.
(para 3-95).
connection.
Install bulb
and lens to
blackout head-
lamp (para
3-95).
2-186
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