Sure. I'd just go to the main ground on the battery, though. Or to any screw or bolt that attaches to the frame. A battery tender doesn't put a lot of current into the battery, so you don't need a really large connecting wire. The small wires that come on the cig lighter socket are plenty thick enough. I cut a hole in the plastic cover by the ignition switch and mounted it there. I'd fuse it though, just in case. Remember if you hook the positive wire to battery, the socket will always be hot. I've run a GPS from it, back before I put the drag bars on. (No room for the RAM Mount now..)