I upgraded to an Ulterra, and after hard wiring it to the battery bank with a breaker it works flawlessly, in saltwater too.
When I tried to run it through the old wires and plug in, it blew a motherboard pretty quick, technology with motherboards have to have constant flow of juice with no surges or drops, else they freakout. G&S Trolling motors did a very fast turnaround on the warranty work and when I got it back a friend stripped out the old wires and ran new wires skipping the plug and going right to the battery bank that has a breaker.
We used those heavy duty wire connectors with the epoxy/sealant that breaks open and waterproofs the connection to tie the motor leads to the new wires. I kept the old Rip Tide that I replaced and put a quick mount on it as well, should the Ulterra need work I'm going put a connector block underneath where the plug was and splice flat connectors to both motors for easy swap out.
Pay close attention to how the plug is mounted so it doesn't get bumped or kicked.
Get a spot lock motor from either maker and plenty of # and volts for your boat and it's money very well spent.