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 TM 9-2320-285-24-1
2-21.
LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
TRAILER STOP LIGHTS WON'T OPERATE (Cont)
Step 2.
Use an ohmmeter to check trailer hand brake stop light switch electrical leads for continuity.
a.
If continuity is not obtained, repair or replace electrical leads (para 2-35c(1)).
b.
If continuity is obtained, replace trailer hand brake stop light switch (para 2-32f(2)).
2-22.
HORN SYSTEM TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ELECTRIC HORN DOES NOT SOUND
Step 1.
Turn key switch to on position.
a.
If voltmeter indicates 12 Vdc, go to step 3 below.
b.
If voltmeter indicates zero, go to step 2 below.
Step 2.
Use a voltmeter to check for 12 Vdc at both sides of horn 10A circuit breaker.
a.
If voltmeter indicates 12 Vdc at only one side of 10A circuit breaker, replace 10A circuit breaker (para 2-
35g).
b.
If voltmeter indicates 12 Vdc at both sides of 10A circuit breaker, repair orange/black electrical lead
c.
If voltmeter indicates zero at both sides of 10A circuit breaker, repair or replace wiring from 10A circuit
breaker to batteries.
Step 3.
Connect jumper lead from horn relay green/orange electrical lead (terminal S) to ground; check if horn
sounds.
a.
If horn sounds, repair horn switch (para 2-33b).
b.
If horn does not sound, go to step 4 below.
2-190
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