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TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download

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TM 9-2350-277-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0089 00 10Y 1. Replace heater (WP 0728 00). 2. Verify no faults found. AY 1. Remove heater indicator cover lens (1) and bulb (2). 2. Measure resistance between bulb center contact and base. 3. Does multimeter read less than 100 ohms? YES NO AYN 1. Replace heater bulb (WP 0702 00). 2. Verify no faults found. A2Y 1. Remove harness 12268797 circuit 400 plug (1) from control box jack (2). 2. Measure voltage between harness 12268797 circuit 400 plug (1) pin and ground. 3. Does multimeter read 17 volts or more? YES NO A2YN 1. Repair harness 12268797 circuit 400 between MASTER SWITCH and heater control box (WP 0382 00). 2. Verify no faults found. 0089 00-3