TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 120 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED b. MASTER RELAY CIRCUIT — CONTINUED (1) MASTER SWITCH INDICATOR LIGHT IS LIT – CONTINUED CONTINUED FROM STEP A 1. 2. 3. 4. 5. Reconnect lead 459 to master relay. Disconnect bulkhead-to-headlights/biilge pump wiring harness from driver’s bulkhead. Place red lead of multimeter on pin H (lead 459) and black lead to ground. Turn MASTER switch ON, and check for voltage. Turn MASTER switch OFF. Is voltage present? Repair or replace lead 459 of bulkhead-to-headlights/bilge pump wiring harness (para 8-47). 1. Reconnect bulkhead-to-headlights/bilge pump wiring harness to driver’s bulkhead. 2. Disconnect lead 459 from bulkhead-to- portable instrument panel wiring harness connector. 3. Place red lead of multimeter in lead 459 and black lead to ground. 4. Reconnect battery ground leads. 5. Turn MASTER switch ON, and check for voltage. 6. Turn MASTER switch OFF. Is voltage present? Repair or replace lead 459 of bulkhead-to-driver’s instrument panel wiring harness (para 8-50). CONTINUED ON NEXT PAGE 3-20