TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
39. HEATER WILL NOT OPERATE IN LOW OR HIGH POSITION
Step 1. Place battery to OFF position.
Step 2. Disconnect lead 400 from heater switch.
Step 3. Place battery switch to ON position.
Step 4. Set multimeter to 50-volt range.
Step 5. Connect multimeter negative lead to vehicle chassis ground. Touch positive lead to lead
400 terminal on heater switch and note voltage reading. Multimeter should indicate
12-13 volts with heater switch in LOW or HIGH position.
a. If battery voltage is not indicated, replace heater switch (para. 3-107).
b. If battery voltage is indicated, clean and tighten heater ground point connection.
c. If heater still does not operate, replace heater (para. 3-292).
END OF TESTING!
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