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Page Title:
MARKER LIGHTS AND TAIL LIGHTS INOPERATIVE (Cont) |
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 TM 9-2320-285-24-1
2-20.
LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
MARKER LIGHTS AND TAIL LIGHTS INOPERATIVE (Cont)
Step 3.
Pull out headlight switch fully.
Use voltmeter to check for 12 Vdc at both sides of 20A marker light circuit breaker.
a.
If voltmeter indicates 12 Vdc at both sides of 20A circuit breaker, repair or replace wiring between 20A
circuit breaker and marker lights (para 2-35a(1), 2-35b(2), or 2-35c(1)).
b.
If voltmeter indicates 12 Vdc at only one side of 20A circuit breaker, replace 20A circuit breaker (para 2-
35g).
c.
If voltmeter indicates zero at both sides of 20A circuit breaker, go to step 4 below.
Step 4.
Pull headlight switch out to first detent position.
Use voltmeter to check for 12 Vdc at headlight switch blue electrical lead.
a.
If voltmeter indicates 12 Vdc, repair or replace wiring between headlight switch and 30 ampere circuit
breaker (para 2-26a(4)).
b.
If voltmeter indicates zero, go to step 5 below.
Step 5.
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 30 ampere circuit
breaker (para 2-26a(4)).
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.
2-187
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