Uncoil the new harness onto the floor and look it over. It includes the two relays previously mentioned, as well as a fuse. The harness has a male plug to connect it to the old harness and four female plugs that connect to the new Delta headlights. Find a good mounting place for the relays and fuse. It's unlikely you'll need to get to them later, but a suitable place for easy access is still a good idea. On our '69, we removed the battery to allow access and mounted the relays and fuse on the inner fender next to the battery. Use the supplied self-tapping screws to secure them in place.