TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
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TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED z. PERSONNEL HEATER CIRCUIT — CONTINUED (1) PERSONNEL HEATER FAILS TO OPERATE General mechanic’s tool kit (item 64, Appx H) Multimeters (item 36, Appx H) TA-1 probe kit (item 43, Appx H) Personnel Required . Two h NOTE Although personnel heater circuit differs slightly between M109A2, M109A3, M109A4, and M109A5 Howitzers, the following troubleshooting procedure applies to all vehicles. 1. Disconnect battery ground leads. 2 Disconnect accessory control box-to-heater/ . blower wiring harness from personnel heater. 3. Place red lead of multimeters in socket C (lead 402) and black lead to ground. 4. Reconnect battery ground leads. 5. Turn MASTER switch ON, HEAT SELECTOR switch to LOW and check for voltage. 6. Turn MASTER and HEAT SELECTOR switches OFF. Is voltage present? Notify support maintenance. CONTINUED ON NEXT PAGE 3-286