Another suggestion .... order the Triumph accessory socket ... a little pricy at $30, but it comes with a small bracket that makes mounting easy. It uses a BMW style plug (smaller than cigarette lighter plug). And it attaches to one of the plugs under tha gas tank in no time. (You'd need to get the Batt Tender adaptor with the BMW male plug). Now you simply plug the Tender into the accessory socket when you want to give it a charge. I put my acc plug on for that purpose, and also as a quick hookup for an electric vest.
Bob
Bob