Does anyone have a wiring diagram for a Harley Davidson 49cc Mini Chopper or know where I can get one?

I believe you are referring to a Chopper 49cc Harley Davidson (Scooter)

Try contacting this company, they may know where to get one if they don't have one. SUNNY SPORTS INC.
15705 Arrow Hwy. Suite 1
Irwindale, CA 91706 Toll Free: 1-888-839-7088
Local: 626-939-0268