You can usually find wiring diagrams in the back of the owner´s manual, Haynes manual or Clymers? manual. Check out the local library. Do you know the year and the model of the GS 450. There is an L model and an E model, possibly others. The diagrams are slightly different. You can possibly get the Suzuki manual for completely fixing the bike on Ebay. I have a 1980 GS450L model, that I´m just starting to fix up. Once I learned how to read the electrical diagram, things got easier. Have fun.