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 259 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
41.
BOTH HEADLAMPS BLINK ON AND OFF.
NOTE
Blackout toggle switch must be set to NORMAL position and
headlamp switch in ON position when doing steps 1 and 2.
1.
Set dimmer switch to
Lamp blinks
Go to step 3.
Go to step 2.
low beam position.
on and off.
2.
Set dimmer switch to
Lamp blinks
Go to step 13.
Headlamp OK.
high beam position.
on and off.
3.
Set blackout toggle
Blackout
Go to step 4.
Repair circuit
switch to BLACKOUT
headlamp
26-GY (para
position.
blinks on
3-127) and/or
and off.
refer to mal-
function 44.
4.
Set blackout toggle
Loose.
Tighten
Go to step 5.
switch to NORMAL
connection,
position.
Check cir-
cuit 26A-DB terminal of
blackout toggle switch.
5.
Turn off headlamp
switch, and go to step
6.
Check circuit 26A-DB
Infinity.
Repair circuit
Go to step 7.
to circuit 26B-DB for
26A-DB (para
continuity.
3-127).
7.
Check circuit 26B-DB
Infinity.
Repair circuit
Go to step 8.
to dimmer switch for
26B-DB (para
continuity.
3-127).
2-134
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