Who did you buy your harness from? Did they not provide a wiring diagram? The harness I bought from YNZ was Tiny proof.
Anyway, I'm for sure NOT an expert but I'd bet the Batt terminal is for the hotwire input from the battery (most likely after going through the ammeter). The Park, Head & Tail should be the outputs to those respective lights. The Aux & "From the rheostat" I don't feel safe advising you about because I don't know. Someone will prolly be along shortly who know much more than me. Good luck.
Edit: Bill jumped in there while I was forming my insightful reply.
If he gives you advise that disagrees with mine, I'd listen to his.
