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			Just completed this mod.  Fwiw you want an spdt switch with either on/on (preferred) or on/off/on.   
 
Also, note that there are two yellow with gray wires in the bundle.  One controls the comfort up windows which wont turn on your fans (yes, i know from experience) 
 
I drilled a small hole by the fusebox for a ground.
		 
		
		
		
		
		
		
		
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