Another question please.....there are 2 black wires,1 red, and 1 orange at the back of the boat where the batteries are.
 
	At the bow receptacle the same, 2 black, one red, and one orange.
 
	However, the 4 prong plug that goes to the old TM only has ONE black, one red, and one orange.  Why only ONE black???  Thank you for helping a confused fisherman!