I currently have a 999c on the front with a 2d transducer on the trolling motor. I bought an Ultrex 112 with Mega. I would like to try and find a used Helix 10 Gen 3 to upgrade the front of the boat and utilize the Mega on the Ultrex. I know I can use the wires from the Ultrex to the Helix my question is , can I use the power cables from the 999c? or do I need to swap them out?