TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM 92350-311 -20-1 (2) COOLANT HEATER MOTOR OVERHEATS I INITIAL SETUP I Tools Equipment Co ndition General mechanic’s tool kit (item 64, Appx H) Engine access door open (TM 9-2350-311-10) Multimeter (item 36, Appx H) Transmission access doors open (TM 9-2350-311-1 0) TA-1 probe kit (item 43, Appx H) Battery access doors open (TM 9-2350-31 1-10) A 1. Disconnect battery ground leads. 2. Disconnect lead 403C from coolant pump. 3. Place red lead of multimeter on lead 403C and black lead to ground. 4. Reconnect battery ground leads. 5. Turn MASTER switch ON and check for voltage. 6. Turn MASTER switch OFF. Is voltage present? Repair or replace lead 403C of coolant heater-to-bulkhead wiring harness (para 14-8). Replace coolant pump (para 14-4). END OF TASK 3-317