TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0086 00 2CY 1. Install heater harness plug on heater control box jack. 2. Remove heater harness plug (1) from heater jack (2). 3. Measure voltage between plug (1) pin C (3) and ground. With HEATER switch on START. 4. Does multimeter read at least 17 volts? YES NO 2CYN 1. Faulty coolant heater harness. 2. Notify your supervisor. 3CY 1. Replace coolant heater (WP 0477 00). 2. Verify no faults found. DY 1. Remove heater control box (WP 0474 00). 2. Measure resistance between lead ends from circuit breaker terminal 17 (1) and ON/OFF/START switch terminal 15 (2) lead ends. 3. Does multimeter read 0 ohms? YES NO DYN 1. Repair faulty lead (WP 0294 00). 2. Verify no faults found. 0086 00-5