I have a wiring diagram that Handy Bikes sent me. It matched up w/ my 505/1D, so it's good. I can fax it to you if you have access to a fax, or it not, I can try to describe it in a post. Let me know... Mike Bartell, who also follows this forum, has alot of Sachs experience. He helped me out when I rebuilt mine. But don't let us scare you off when we admit that neither of ours yet run!