TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 399 of 1275
TM 9-2350-311-20-1 CONTINUED FROM STEP E F 1. With multimeters disconnected and socket B (lead 159A) grounded, place VENTILATOR BLOWER switch in opposite position of where voltage was obtained in steps D and E. 2. Place red lead of multimeters in socket C (lead 159B) and black lead in socket A (lead 159C). 3. Turn MASTER switch ON and check for voltage. 4. Turn MASTER switch OFF. Is voltage present? Repair or replace leads 159A, 159B and/ or 159C accessory control box ventilator blower switch lead (para 8-67). CONTINUED FROM STEP E G 1. Reconnect accessory control box-to-heater/ blower wiring harness to accessory control box. 2. Disconnect lead 10 from accessory control box. 3. Place red lead of multimeter in lead 10 and black lead to ground. 4. Turn MASTER switch ON and check for voltage. 5. Turn MASTER switch OFF. Is voltage present? Troubleshoot master relay circuit (para 3-3b). CONTINUED ON NEXT PAGE 3-299