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 TM 9-2320-285-24-1
2-20.
LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2.
TRAILER LIGHTS INOPERATIVE (24-VOLT TRAILER) (Cont)
Step 10. Turn key switch to on position.
Push up 24V INVERTER switch.
Pull out headlight switch fully.
Push in hazard warning switch.
Use voltmeter to check for 24 Vdc at terminals 7, 8, and 9 of 24V
inverter.
a.
If voltmeter indicates zero at all three terminals, replace 24V inverter (para 2-30).
b.
If voltmeter indicates 24 Vdc at all three terminals, replace 24V receptacle (para 2-30) or trailer lighting
cable (para 2-31f).
3.
TURN SIGNAL LIGHTS INOPERATIVE
Step 1.
Check if all turn signal lights are inoperative.
a.
If all turn signal lights are inoperative, go to step 2 below.
b.
If one or more turn signal lamps light, replace defective bulbs (para 2-31b or 2-31d).
Step 2.
Unplug turn signal flasher from wiring harness connector (para 2-26a(10)).
Depress brake pedal and have assistant watch stop lights.
a.
If stop lamps light, go to step 3 below.
b.
If stop lamps do not light, replace 20 ampere circuit breaker (para 2-35g).
Step 3.
Plug a known good turn signal flasher into wiring harness connector (para 2-26a(10)).
Check operation of turn signal lights and hazard warning flashers.
a.
If one lamp does not light, repair wiring between steering column connector and affected lamp by
splicing a new length of the same size (gage).
b.
If left-turn lamps do not light, repair steering column connector and turn signal switch (para 2-27).
c.
If hazard warning flashers are inoperative, replace hazard warning switch (para 2-27).
2-184
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