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 261 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 (Continued).
10.
Check circuit 27-BK
Loose.
Tighten
Go to step 11.
terminal of dimmer
connection.
switch.
11.
Turn off headlamp
switch, and go to
step 12.
12.
Check circuit 27-BK
Infinity.
Repair circuit
Low beam head-
for continuity.
27-BK (para
lamp circuit
3-127).
OK.
13.
Set blackout toggle
Blackout
Repair circuit
Go to step 14.
switch to BLACKOUT
headlamp
26-GY (para
position.
blinks on
3-127).
and off
14.
Set blackout toggle
Loose.
Tighten
Go to step 15.
switch to NORMAL
connection.
position.
Check cir-
cuit 26A-DB terminal
of operation switch.
15.
Turn off headlamp
switch, and go to step
16.
16.
Check circuit 26A-DB
Infinity.
Repair circuit
Go to step 17.
to circuit 26B-DB for
26A-DB (para
continuity.
3-127).
17.
Check circuit 26B-DB
Infinity.
Repair circuit
Go to step 18.
to dimmer switch for
26B-DB (para
continuity.
3-127).
18.
Turn on headlamp
switch, and go to step
Go to step 20.
19.
19.
Check circuit 26B-DB
Loose.
Tighten
Go to step 20.
terminal of dimmer
connections.
switch.
2-136
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