Alternator (under left cover) → 2 or 3 wires to regulator/rectifier → DC to battery.
ALTERNATOR --(Y,W)--> REGULATOR --+-- BATTERY (+) +-- CDI (optional charge) PICKUP COIL -----(Bl/Y)---------> CDI CDI -----------(B/W)----------> IGNITION COIL IGN COIL -----------------------> SPARK PLUG
This duo generates power and converts AC to DC to charge your battery. CDI Unit: The "brain" that controls ignition timing. suzuki gn 125 wiring diagram
⚠️ : If the battery is dead, the bike will not run – the CDI needs DC power.
Unlike cars with alternators, the GN125 uses a magneto (a stator under the left engine cover). It has two main windings: Alternator (under left cover) → 2 or 3
✅ No magneto, no AC CDI. If battery is below ~10V → no spark.
The Suzuki GN125 has been produced for decades with minor wiring differences: ⚠️ : If the battery is dead, the
💡 Never use "twist and tape" for motorcycle wiring. Vibrations will shake it loose in miles. Multimeter: Essential for checking continuity and voltage. Crimp Tool & Bullet Connectors: For factory-style repairs. Heat Shrink Tubing: Protects joints from moisture. Sandpaper: For cleaning rusted ground points on the frame. Reading the Diagram for Custom Builds