I fought this same problem for a long time.  I ended up having to replace my starter along with the solenoid to finally correct it. That was after going through about 4 solenoids and replacing the ignition switch.  Good luck! 
		
	
		
		
		
		
		
		
			
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				2006 Mustang GT
 
1990 LX 
GT-40 motor  262 horsepower, 307ft-lbs (sold but forever loved)
 
1998 Contour SVT
 Rice Haters Club Member #244
			  
		
		
		
		
		
		
	
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