If you dont want to rebuild the harness, a new one is around $100 if I remember correctly.
Or go here and download the wiring diagram for your cart (G2a)
http://www.courtesygolfcars.com/yamaha-schematics
Without quite a but more detail of what kind of diag work you've performed or what exactly you're currently working with we really cant provide any specific help but that should give you direction anyways