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Old 02-04-2011, 11:09 PM   #340
TonyNo

 
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Drives: 2016 2SS, SW
Join Date: Oct 2009
Location: Chicago Suburbs
Posts: 1,079
Usually, the middle is common, which would be the lights. The other two would be the dome circuit and constant power, for example. This would allow one position to be dome-controlled and the other to be manual.
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