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TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download

Page 350 of 1275

TM 9-2350-311 -20-1 3-3 TROUBLESHOOTING CHART — CONTINUED u. SERVICE HEADLIGHTS, TAILLIGHT, AND STOP (3) RIGHT OR LEFT HEADLIGHT FAILS TO OPERATE; LIGHT CIRCUIT — CONTINUED ALL OTHER LIGHTS OPERATE Personnel Required General mechanic’s tool kit (item 64, AppX H) Two Multimeters (item 36, AppX H) TA-1 probe kit (item 43, AppX H) , Equipment Conditions (Long test leads may be needed for some tests; Engine access door open (TM 9-2350-311-10) 16 AWG wire may be used as an extension.) Transmission access doors open (TM 9-2350-311-10) NOTE Both headlight assemblies have identical wiring. The following procedures apply to both left and right headlight assemblies. A 1. Disconnect bulkhead-to-driver’s instrument panel wiring harness from dimmer switch. 2. Place a jumper wire from socket G (lead 16) to socket E (lead 18). 3. Turn MASTER switch ON and place main light switch in SER. DRIVE position. 4. Check headlight for operation. 5. Turn MASTER switch OFF. Does headlight operate? Replace dimmer switch (para 8-17). CONTINUED ON NEXT PAGE 3-250