TRAILER LIGHTS INOPERATIVE (24-VOLT TRAILER)

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)

Step 1.

Turn key switch and 24V INVERTER switch to on position.

Watch 24V INVERTER light.

a. If 24V INVERTER lamp lights, go to step 5 below.

b. If 24V INVERTER lamp does not light, go to step 2 below.

Step 2.

Use a voltmeter to measure voltage from tractor ground to terminals of 24V INVERTER switch.

a. If voltmeter indicates 12-14 Vdc at one terminal, and zero at the other terminal, replace 24V

INVERTER switch (para 2-26a(9)).

b. If voltmeter indicates zero at both terminals, go to step 3 below.

c. If voltmeter indicates 12-14 Vdc at both terminals go to step 5.

Step 3.

Push up all FLOOD LIGHT switches and watch flood lights.

a. If one or more flood lamps light, push down FLOOD LIGHT switches; then go to step 4 below.

b. If all flood lights are inoperative, replace 25 ampere circuit breaker (para 2-35g).

Step 4.

Check for broken conductor in brown/white electrical lead between 4V INVERTER switch and 25

ampere circuit breaker in fuse block.

a. If conductor is broken, repair (para 2-35c(1) or 2-35c(2)).

b. If conductor is not broken, go to step 5 below.

Step 5.

Turn key switch to on position.

Push up 24V INVERTER switch.

Use a voltmeter to measure voltage at both terminals of ammeter 40A circuit breaker.

a. If voltmeter indicates zero volts at one terminal and 12-14 Vdc at second terminal, replace 40A

circuit breaker (para 2-26e).

b. If voltmeter indicates zero at both terminals, repair or replace wiring between ammeter and 40A

circuit breaker (para 2-26e).

c. If voltmeter indicates 12-14 Vdc at both terminals go to step 6.

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