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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 (Cont)
Step 5.
Unplug dimmer switch connector (para 2-26a(5)).
Use an ohmmeter to check dimmer switch for continuity.
a.
If continuity is not obtained between center lug and each side lug, or continuity is obtained between any
one lug and the case, replace dimmer switch (para 2-26a(5)).
b.
If correct continuity is obtained, go to step 6 below.
Step 6.
Pull out headlight switch fully.
Use a voltmeter to check for 12 Vdc at headlight switch terminal blue/orange electrical lead.
a.
If voltmeter indicates 12 Vdc, repair or replace wiring between headlight switch and dimmer switch (para
2-35a(2) or 2-35c(1)).
b.
If voltmeter indicates zero, go to step 7 below.
Step 7.
Use voltmeter to check for 12 Vdc at both terminals of headlight switch 30 ampere circuit breaker.
a.
If voltmeter indicates 12 Vdc at both terminals, replace headlight switch (para 2-26a(4)).
b.
If voltmeter indicates 12 Vdc only at battery side of 30 ampere circuit breaker, replace circuit breaker
c.
If voltmeter indicates zero at both sides of 30 ampere circuit breaker, repair or replace wiring from 30
ampere circuit breaker to ammeter and batteries.
5.
MARKER LIGHTS AND TAIL LIGHTS INOPERATIVE
Step 1.
Pull out headlight switch fully.
Check operation of marker lights and tail lights.
a.
If all lights are inoperative, go to step 3 below.
b.
If one or more lights operate properly, go to step 2 below.
Step 2.
Check for continuity of each inoperative light bulb.
a.
If a bulb is defective, replace (para 2-31b or 2-31e).
b.
If bulbs are okay, repair wiring (para 2-31b or 2-31e).
2-186
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