TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 348 of 1275
TM 9-2350-311 -20-1 3-3 TROUBLESHOOTING CHART — CONTINUED u. SERVICE HEADLIGHTS, TAILLIGHT, AND STOP (2) HEADLIGHTS OPERATE ON ONE BEAM ONLY LIGHT CIRCUIT — CONTINUED Tools Personel 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 Condition (Long test leads may be needed for some tests; Engine access door open (TM 9-2350-311-1 O) 16 AWG wire may be used as an extension.) Transmission access doors open (TM 9-2350-311-1 O) NOTE Both headlight assemblies have identical wiring. The following procedures apply to both right and left headlight assemblies. 1 A 1. Remove inoperative headlight assembly (para 8-21 ). 2. If low beam is inoperative, place red lead of multimeters in socket A (lead 18) and black lead to ground. 3. Turn MASTER switch ON, place dimmer switch in the low beam position, and check for voltage. 4. If high beam is inoperative, place red lead of multimeters in socket B (lead 17) and black lead to ground. 5. Turn MASTER switch ON, place dimmer switch in the high beam position, and check for voltage. 6. Turn MASTER switch OFF. Is voltage present? Replace sealed beam unit (para 8-22). 1 CONTINUED ON NEXT PAGE 3-248