TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9--2350--311--10 2--126 2--10 OPERATING PROCEDURES — CONTINUED 2--10.7 Operating Miscellaneous Items — Continued c. Dome Light Assemblies NOTE Turn MASTER switch to ON to operate dome light assemblies. 1 Blue (blackout) light is on when knob (6) is turned fully clockwise (position B). 2 White light is on when push button (7) is pressed and knob (6) is turned counterclockwise past stop (position C). 3 Both lights are off when knob (6) is in center (position A). 6 7