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 BY 1. Remove harness 10943141 plug (1) from heater control box jack (2). 2. Measure voltage between heater control box jack (2) pin C (3) and ground with HEATER switchon START. 3. Does multimeter read at 17 volts or more? YES NO GO TO CY (PAGE 0089 00-6) B2Y 1. Install harness 10943141 plug on heater control box jack. 2. Remove harness 10943141 plug (1) from heater jack (2). 3. Measure voltage between harness 10943141 plug (1) pin C (3) and ground with HEATER switchon START. 4. Does multimeter read at least 17 volts? YES NO B2YN 1. Replace faulty harness 10943141 (WP 0382 00). 2. Verify no faults found. B3Y 1. Replace heater (WP 0728 00). 2. Notify supervisor. 0089 00-5