Ok trying to help a friend set up a new Terrova trolling motor to a Helix 9 gen 2. The cable for the transducer is a small silver colored 5 pin but the only cable listed to connect it to the helix is a large 14 pin? He had is connected to a Lowrance finder before. Am I correct in that you have to put a transducer on the trolling motor to connect it to the new Helix? Thank you for any help?