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 A3Y 1. Remove heater control box (WP 0736 00). 2. Measure resistance between lead ends from circuit breaker terminals 16 (1) and 17 (2). 3. Does multimeter read 0 ohms? YES NO A3YN 1. Replace heater circuit breaker (WP 0737 00). 2. Verify no faults found. A4Y 1. Measure resistance between lead ends from circuit breaker terminal 17 (1) to indicator light terminal 3 (2). 2. Does multimeter read 0 ohms? YES NO A4YN 1. Repair/replace faulty lead (WP 0382 00) or (WP 0737 00). 2. Verify no faults found. A5Y 1. Replace indicator light assembly (WP 0737 00). 2. Verify no faults found. 0089 00-4