I would pull a chassis harness out of an old truck at the JY to give you all your lights and such, a one-wire alternator conversion or an external regulator so the battery will charge, and you're in business.
it's currently wired up with the air-dog on a toggle switch and the starter on a push-button... just to get it to drive onto a trailer. it was "working" just not charging, but we were trying to start it the other day, and it just quit cranking and the air dog wasn't coming on. I don't know if it blew a fusable link or if the ignition switch **** the bed or what. Didn't want to mess with it, so I just ran new battery cables to the starter and the block, wired up a contact switch for the starter and ran a toggle to the air-dog relay! LOL