I have a Minnkota Terrova hooked up to Humminbird 688, the 688 worked perfectly before hooking up to the Terrova.
The 688 now never locks on the bottom, this is the screen I get, all the time the depth is searching for the bottom, jumping all over the place.
I had the built in transducer removed and replaced, changed out the adapter cable twice, and have run a jumper wire from the battery
to the fishfinder as requested by the factory. I still get this picture. everything else works on fishfinder, by the way this was taken
in 20 feet of water. I have Diamond Sports Marine helping, and we have a call in to the factory.
Just wondered if any one else had like problem,...thank JIM