I've received the transducer from the guy on Ebay. The unit he sent has 4 wires and a shield. I do not have the boat here so I can't check the existing wire/cable coming from the current transducer. I do know the harness is 4 pin with certain colors (see below). The unit I received has totally different colors so now I need to identify which goes to which. I checked the resistance and the only ones that were not infinity were Shield to Green (3.8 m-ohm) and White to Brown (13.2 k-ohm). All other were of course, infinity. You folks have a clue which wires match up to the harness?

