Yamaha Motorcycle Wiring Diagrams - Classic Cycles Yamaha XS650 XS 650 Simplified Electrical Wiring Diagram Schematic HERE. Yamaha XS850 XS 850 Electrical Wiring Diagram Schematics 1976 to 1981 HERE. Yamaha XS1100 XS 1100 Electrical Wiring Diagram Schematics 1978 to 1981 HERE. Yamaha XT500 XT 500 Electrical Wiring Diagram Schematics 1976 to 1981 HERE Yamaha 500 XT – Logicate blog Here is a wiring diagram for the lighting and charging circuit on these early bikes (XT500 C/D 1976/77) Notice the Headlight on/off switch (three red circles) has three poles to switch the regulator from the headlight to the battery charging circuit and to turn the taillight on when the headlight switch is on. Yamaha XT500 Colour Motorcycle Wiring Diagram Yamaha XT500 full colour laminated wiring diagram Pictures displayed are taken from various diagrams and are not indicative of any particular models. Display per page Large A3 (12" x 16") laminated colour wiring diagrams for Yamaha XT500 C & D 1976 - 78 UK Spec motorcycles