Dave, 
 
Are you 6v or 12v? 
 
If you are 12v there are some fantastic solid state regulators that work with both generator or alternator. About the size of a matchbox so will fit inside the old regulator cover. I don't know enough about them but maybe also available for 6v? 
 
Lang
		 
		
		
		
		
		
		
		
		
	
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