2011 900xt fan wireing

guys i darn nere blew myd902 up because the rad fan didnt come on and gauge was almost in the Red. I need help wth the two wires in the plug connticion. wich one is 12 volt from battery? iam hard wireing a manual toggle switch. I dont want to burn up somthing in the fan motor!! THANKS for any help guys......Scotty
 
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