TM 9-2350-247-20-1
COOLANT HEATER MALFUNCTIONSContinued
0086 00
2BY
1. Remove rear main harness circuit 400A plug (1) from control box
jack (2).
2. Measure voltage between main harness circuit 400A plug (1) pin
and ground.
3. Does multimeter read more than 17 volts?
YES
NO
2BYN
1. Repair main harness circuit 400
between master switch and heater
control box (WP 0294 00).
2. Verify no faults found.
3BY
1. Remove heater control box (WP 0474 00).
2. Measure resistance between lead ends from circuit breaker
terminals 16 (1) and 17 (2).
3. Does multimeter read 0 ohms?
YES
NO
3BYN
1. Replace heater circuit breaker
(WP 0472 00).
2. Verify no faults found.
0086 00-3