TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 415 of 1275
TM9-2350-311-20-1 CONTINUED FROM STEP A B 1. Reconnect bulkhead-to-coolant heater control box wiring harness to coolant heater. 2. Disconnect battery ground leads. 3. Disconnect lead 400 from heater control box. 4. Place red lead of multimeter in lead 400 and black lead to ground. 5. Reconnect battery ground leads. 6. Turn MASTER switch ON and check for voltage. 7. Turn MASTER switch OFF. Is voltage present? Troubleshoot master relay circuit (para 3-3b). C 1. Reconnect lead 400 to heater control box. 2. Disconnect battery ground leads. 3. Disconnect bulkhead-to-coolant heater control box wiring harness from heater control box. 4. Place red lead of multimeter on pin C (lead 430C) and black lead to ground. 5. Reconnect battery ground leads. 6. Turn MASTER switch ON, heater control switch to start, and check for voltage. 7. Turn MASTER and heater control switches OFF. Is voltage present? I Replace heater control box (para 14-9). CONTINUED ON NEXT PAGE 3-315