TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
34. LOW AIR PRESSURE WARNING SYSTEM INOPERATIVE
Test 1. Test input voltage to buzzer.
Step 1. Turn battery switch and ignition switch to OFF position.
Step 2. Disconnect lead 85 from buzzer.
Step 3. Drain air pressure from air tanks to less than 54 psi (372 kPa) (TM 9-2320-260-10).
Close drain valve.
Step 4. Set multimeter to a voltage range that will measure 24 volts.
Step 5. Turn battery switch to ON position.
Step 6. Turn ignition switch to RUN position.
Step 7. Touch negative lead of multimeter to frame ground. Voltage should be present.
Step 8. Touch positive lead of multimeter to contact end of lead 85.
a. Replace buzzer if voltage is present (para. 4-23).
b. If voltage is not present, go to test 2.
Test 2. Test input voltage to warning light.
Step 1. Disconnect lead 85 from warning light.
Step 2. Drain air pressure from air tanks to less than 54 psi (372 kPa) (TM 9-2320-260-10)
Close drain valve.
Step 3. Set multimeter to a range that will measure 24 volts.
Step 4. Turn battery switch to ON position.
Step 5. Turn ignition switch to RUN position.
Step 6. Touch positive lead of multimeter to contact end of lead 85.
Step 7. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. Replace warning lamp if voltage is present (para. 4-15).
b. If voltage is not present, go to test 3.
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