I have a 1988 skeeter SF 150 XF . When I got it, it didn't have a trolling motor on it . I just bought a used 71 lbs motorguide for it and i'm wondering how to wire it up. The boat has 3 wires going into the plug but the trolling motor only has 2 red and black.. any help would be grateful. Jamey This is a 24v motor