TM 9-2350-261-20-1
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Install heater harness on heater control box jack.
Remove heater harness 402A plug (1) from heater
fuel pump jack (2).
Measure voltage between plug (1) pin and ground
with HEATER switch on START.
Does multimeter read more than 17 volts?
1. Replace coolant heater fuel pump (page 32-16).
2. Verify no faults found.
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Remove heater control box (page 32-42).
Measure resistance between lead ends of heater
output jack (1) pin A (2) and ON/OFF/START
switch terminal 14 (3).
Does multimeter read 0 ohms?
1. Replace heater ON/OFF/START switch
(page 32-42).
2. Verify no faults found.
1. Faulty heater harness
circuit 402.
2. Notify your supervisor.
4
1. Repair/replace faulty Iead
(page 14-3).
2. Verify no faults found.
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