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 263 of 926
TM 9-2320-283-20-1
TROUBLESHOOTING.
2-11.
TROUBLESHOOTING PROCEDURES (Continued).
MALFUNCTION
INSTRUCTION
INDICATION
YES
NO
42.
ONE HEADLAMP NOT WORKING.
NOTE
•
Blackout toggle switch must be set to NORMAL
position and headlamp switch in ON position when
doing the following checks.
•
Faulty
right-side
headlamp
is
shown
in
this
procedure.
Apply
similar troubleshooting technique
for left- side headlamp.
1.
Set dimmer switch to
Headlamp
Replace
Go to step 2.
low beam position.
works.
headlamp
(para 3-91).
2.
Set dimmer switch to
Headlamp
Replace
Go to step 3.
high beam position.
works.
headlamp
(para 3-91).
3.
Remove right-side
headlamp assembly far
enough to expose
junction block (para
3-91), and go to step
4.
4.
With dimmer switch set
12-volts dc
Go to step 5.
Repair circuit
on high beam, check for
nominal.
28D-BK, 28C-DG,
voltage at circuit
and/or 16-WH
16-WH terminal of
(para 3-127).
headlamp connector.
Install right-
side headlamp
assembly (para
3-91).
NOTE
With
positive lead on
circuit 16-WH, check ground using
negative lead when doing the following checks.
2-138
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