Greg Bender
http://www.thisoldtractor.com/gtbender
Mike Ittner was kind enough to let me borrow his switch so I might create this cross reference. This switch was used on the 1973 - 1977 Suzuki GT 750 (Water Buffalo).

Suzuki handlebar switch 577-6

Suzuki handlebar switch 577-6

Suzuki handlebar switch 577-6

Suzuki handlebar switch 577-6
| Function | Suzuki 577-6 | Moto Guzzi |
|---|---|---|
| Horn (wire to distribution panel) | Dark Green | Black |
| Right turn signal / turn indicator | Light Green | Yellow |
| Turn signal / turn indicator (live wire from fuse panel; goes through flasher unit / blinker unit) | Light Blue | Purple |
| Left turn signal / turn indicator | Black | Yellow & Black |
| Running lights / parking lights (tail light, gauge illumination lights, etc.) | Red with Green stripe | Red & Gray |
| Headlight high beam | Black with White stripe | Green & Black |
| Live wire from fuse panel | Separate Orange wire joined with a bullet connector to a separate Green with White stripe wire | Brown |
| Headlight low beam | Gray | Green |