1979 Yamaha xs1100

1979 TRIUMPH SPITFIRE
1,000 MILES • AUTOMATIC
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DOLLABILL25
  • MEMBER
  • 46 POSTS
Sorry but I don't know if you guys do motorcycles it looks like you guys might but I was just looking for a "bare Bones" wiring diagram for a 1979 Yamaha xs1100. If you could help me out in any way I would really appreciate it thank you
May 10, 2026 at 6:29 PM
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STRAILER
  • CAR REPAIR CONTRIBUTOR
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I dont know if this will help but it is all we have. We mostly work on cars.

BATTERY (+)
|
|--- Main Fuse 20A/30A
|
+--- Ignition Switch
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+--- Kill Switch
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+--- Ignition Coils (+)
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+--- TCI/Ignitor Power

IGNITION COILS (-)
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+--- To TCI/Ignitor trigger outputs

PICKUP COILS / SIGNAL GENERATOR
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+--- To TCI/Ignitor input wires

TCI / IGNITOR
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+--- Ground
+--- Coil trigger wires
+--- Pickup coil wires
+--- Switched 12V from kill switch

BATTERY (-)
|
+--- Frame Ground
+--- Engine Ground
+--- TCI Ground

ALTERNATOR / STATOR
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+--- Regulator/Rectifier
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+--- Battery (+) through fuse
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+--- Ground

Do not to eliminate the main fuse or the engine/frame ground strap. On old bikes, bad grounds cause half the electrical problems.
May 11, 2026 at 5:08 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.