Thanks to all you guys, for anyone wondering, the separate battery didn’t work but there were 4 different wires coming out of the unit power cable that are all grounds, all 4 of them had to be grounded and it solved the problem
Yeah I would sell the u it if that’s what your wondering, I would also like to know where you go the cord to go from the trolling motor to the Lowrance, I’m from Minnesota btw. Look my name up on Facebook and message me your number.