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 TM 9-2320-285-24-1
2-20.
LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
HEADLIGHTS INOPERATIVE
Step 1.
Pull out headlight switch fully.
Check if all lights are inoperative.
Press dimmer switch to check operation of low and high beam
headlights.
a.
If all lights are inoperative, go to step 7 below.
b.
If both headlights are inoperative and all other lights function properly, go to step 2 below.
Step 2.
Use an ohmmeter to check for continuity of low and high beam connections at each headlight.
a.
If bulbs are defective, replace (para 2-31a).
b.
If bulbs are not defective, go to step 3 below.
Step 3.
Pull out headlight switch fully.
Use a voltmeter to check for 12 Vdc at low and high beam terminals at each headlight.
a.
If voltmeter indicates 12 Vdc at both terminals, repair or replace ground lead at headlight plug (para 2-
31a).
b.
If voltmeter indicates zero at all four terminals, go to step 4.
c.
If voltmeter indicates zero at only one low beam terminal or only one high beam terminal, repair or
replace headlight wiring (para 2-31a or 2-35b(1)).
d.
If voltmeter indicates zero at both low beam or both high beam terminals, go to step 5 below.
Step 4.
Unplug dimmer switch connector (para 2-26a(5)).
Pull out headlight switch fully.
Use voltmeter to check for 12 Vdc at dimmer switch plug blue/orange electrical lead.
a.
If voltmeter indicates 12 Vdc, go to step 5 below.
b.
If voltmeter indicates zero, go to step 6 below.
2-185
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