1979 Yamaha xs1100

1979 TRIUMPH SPITFIRE
1,000 MILES • AUTOMATIC
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DOLLABILL25
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
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
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
|
+--- Kill Switch
|
+--- Ignition Coils (+)
|
+--- TCI/Ignitor Power

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

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

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

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

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