Replaced the trolling motor this past weekend, and had a guy come look to buy my old one. He drives up from Forsyth this evening. Likes the unit, and before he pays, I said " I just took this off the boat and I know it works as it should, but for peace of mind, I want to show you it works". He obliged and so I had a spare battery sitting next to it. I hooked up the red to positive, and black to negative "took plug off to put on new motor". Hit the button, and nothing. Dead battery I thought. Lifted it up and onto the rear deck of my boat. Popped open the battery compartment, again hooked up red to pos. and black to neg. This time I kno it's going to spin as my boat batteries are charged. Had the guy hit the button as I held the wires,and nothing. Hmmm, I thought, I just took this off the boat and knew it worked. After a few minutes of looking for a reset, loose wire, anything, the guy said if I got it figured out that he would come back and buy it. Well I called a buddy on this site, and ran by my delima. He didn't know what it could be. Well about an hour later, Andy calls back and said " you know what, that's a 24 volt system". Duh, and I call myself a boat guru.