TM 5-3805-261-20BODY, CHASSIS AND HULL ACCESSORY ITEMS TROUBLESHOOTING AND MAINTENANCE PROCEDURES.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONf.BOTH HEATER FANS FAIL TO OPERATE.Reset circuit breaker (Figure 14-1).Figure 14-1.Step 2.Check fuse number 20A.If fuse is blown--replace. Refer to paragraph 7-63.Step 3.Test the continuity of the heater wiring harness between the two heater motors. Refer to WiringHarness Troubleshooting, paragraphs 7-114 and 7-115 for continuity test procedures.If heater wiring harness is damaged or defective--replace. Refer to paragraph 7-114.g.ONE HEATER FAN FAILS TO OPERATE.Step 1.Check heater motor.If the motor is damaged or defective--replace. Refer to paragraph 14-9.Step 2.Test the continuity of the heat switch. Refer to Wiring Harness Troubleshooting, paragraphs 7-114and 7-115 for continuity test procedure.If the switch is damaged or defective--replace. Refer to paragraph 4-9.Step 3.Test the continuity of the heater wiring harness between the heater motor and heater switch. Referto Wiring Harness Troubleshooting, paragraphs 7-114 and 7-115 for continuity test procedure.If heater wiring harness is damaged or defective--replace. Refer to paragraph 7-114.14-5
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