TM 9-2350-247-20-1
COOLANT HEATER MALFUNCTIONSContinued
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