Adding a Tail light? Or maybe renewing the Tailight circuitry? Here's a  repair kit for the Tailight circuit. Comes with new pigtail and contact & new socket components. New protective wire loom as well. Let us know what model Tractor you have and whether your Tractor is equipped with the 4" round lamp, or the "Bullet" fender lamp.  For Model G, see 1504-02B.