TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 124 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED b. MASTER RELAY CIRCUIT — CONTINUED (2) MASTER SWITCH INDICATOR LIGHT FAILS TO OPERATE; MASTER SWITCH IS ON — CONTINUED CONTINUED FROM STEP B 1. Reconnect lead 459L to MASTER switch indicator light. 2. Disconnect lead 459 from MASTER switch. 3. Place red lead of multimeter in MASTER switch and black lead to ground. 4. Turn MASTER switch ON and check for voltage. 5. Turn MASTER switch OFF. Is voltage present? Replace or repair lead 459 of portable instrument panel wiring harness (para 1. Reconnect lead 459 to MASTER switch. 2. Disconnect lead 459B from MASTER switch. 3. Place red lead of multimeter in lead 459B and black lead to ground. 4. Turn MASTER switch ON and check for voltage. 5. Turn MASTER switch OFF. Is voltage present? 1 Replace MASTER switch (para 8-17). CONTINUED ON NEXT PAGE 3-24