i am trying to wire a mc18 loom onto a mc16 motor but the mc16 motor only has a 3 prong plug on it and the 18 has a 4prong. 
the exta wire is an earth right???
how do i get the other wires wired in the correct order when putting it into the new 4 prong plug???            				            
            
            
			
























 
            
            
            
