Re: Ertl Ford 7710 Tractor
			 
			 
			
		
		
		
			
			To make an "electrical differential", wire the two motors in series.  When one wheel senses a heavier load (usually the inside wheel when turning) the other wheel will speed up.  Of course, you have to use different voltage motors than normal - ex: if 12V battery, then each motor should be rated at 6V.   
This method is used in some model wheel loaders that have 4 wheel  motors.  Motors on each axle are in series, while the front & rear axles are wired in parallel. 
 
Ken
		 
		
		
		
		
		
		
			
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