TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 414 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED ac. WINTERIZATION KIT CIRCUIT — CONTINUED (1) COOLANT HEATER FAILS TO OPERATE INITIAL SETUP Tools General mechanic’s tool kit (item 64, Appx H) Engine access door open (TM 9-2350-311-1 O) Multimeter (item 36, Appx H) Transmission access doors open (TM 9-2350-311-1 O) 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 bulkhead-to-coolant heater control box wiring harness from coolant heater. 3. Place red lead of multimeter on pin C (lead 430C) and black lead to ground. 4. Reconnect battery ground leads. 5. Turn MASTER switch ON and heater control switch to start. 6. Check for voltage. 7. Turn MASTER and heater control switches OFF. Is voltage present? 1 Replace coolant heater assembly CONTINUED ON NEXT PAGE 3-314 Equipment Conditions