TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
37. HOT WATER PERSONNEL HEATER DOES NOT OPERATE OR DOES NOT OPERATE IN LOW POSITION
Test 1. Check horn operation.
Push horn button.
a. If horn fails to operate, go to malfunction 35.
b. If horn is operational, voltage is present at input of heater circuit breaker. Go to
test 2.
c. If heater high/low switch operates in HIGH but fails to operate in LOW, go to test 5.
Test 2. Check heater high/low switch for power input.
Step 1. Set multimeter to a range that will measure 24 volts.
Step 2. Disconnect lead 419 at rear of heater switch.
Step 3. Touch positive lead of multimeter to contact end of lead 419 at heater switch.
Step 4. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, go to test 3.
b. Repair or replace lead 419 if voltage is not present (para. 4-52).
Test 3. Test for power output at heater high/low switch.
Step 1. Set multimeter to a range that will measure 24 volts.
Step 2. Disconnect lead 400 at rear of heater switch.
Step 3. Touch positive lead of multimeter to contact end of power output at the heater switch.
Step 4. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, go to test 4.
b. If voltage is not present, replace heater switch (para. 14-12).
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