TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
28. WARNING LAMP FAILS TO OPERATE
Test 1. Test battery and ignition switch for voltage output.
Step 1. Position battery switch to ON position.
Step 2. Position ignition switch to RUN position.
Step 3. Push horn button. Horn should sound.
a. If horn sounds, go to test 2.
b. If horn fails to sound, go to malfunction 35.
Test 2. Check continuity of warning light.
Step 1. Disconnect warning light harness at warning lamp.
Step 2. Set multimeter to RX1 scale.
Step 3. Touch positive lead of multimeter to warning lamp input lead 325.
Step 4. Touch negative lead of multimeter to frame ground. Continuity should be present.
a. If continuity is present, go to test 3.
b. Replace warning lamp if continuity is not present (para. 4-39).
Test 3. Test circuit breaker for voltage.
Step 1. Disconnect lead 10 from circuit breaker at lead 325.
Step 2. Position battery switch to ON position.
Step 3. Position ignition switch to RUN position.
Step 4. Set multimeter to a range that will measure 24 volts.
Step 5. Touch positive lead of multimeter to contact end of lead 10.
Step 6. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, go to step 7.
b. Repair or replace lead if voltage is not present (para. 4-52 or 4-55).
Step 7. Install lead 10 on circuit breaker and disconnect lead 325.
Step 8. Touch positive lead of multimeter to contact end of circuit breaker.
Step 9. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, go to test 4.
b. Replace circuit breaker if voltage is not present (para. 4-20).
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