TM-9-2350-261-20-1 Unit Maintenance Manual Volume 1 M113A2 M577A2 M1064 M1068 M1059 M901A1 Download
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TM 9-2350-261-20-1 COOLANT HEATER MALFUNCTIONS — Continued 0070 00 FY 1. Remove heater control box (WP 0648 00). 2. Measure resistance between lead ends of heater output jack (1) pin A (2) and ON/OFF/START switch terminal 14 (3). 3. Does multimeter read 0 ohms? FYN 1. Repair/Replace faulty lead (WP 0312 00). 2. Verify no faults found. F2Y 1. Replace heater ON/OFF/START switch (WP 0648 00). 2. Verify no faults found. GY 1. Measure voltage between coolant pump to heater harness terminal circuit 402B (1) on coolant pump and ground with switch in start position. 2. Does multimeter read less than 17 volts? GYN 1. Replace coolant heater pump (WP 0652 00). 2. Verify no faults found. 0070 00-8