Do you have a specific year or mod you’re struggling with? Post your question on the GN125 Riders Forum with a photo of your current wiring, and the community will help you decode it.

Suzuki uses a consistent color-coding system. Memorizing these makes reading the physical harness much easier: Main power directly from the battery. Black/White: Ground (Earth). This is the most common wire. Orange: Switched power (live only when the key is "On"). Gray: Lighting circuit (instrument lights and tail light). Light Green: Right turn signal. Black: Left turn signal. White/Blue: High beam headlight. Yellow/White: Charging circuit from the stator. Common Troubleshooting Scenarios 1. No Power When Key is Turned

If you have a PDF or a paper diagram, you will notice colors like Black/White, Orange, Light Green, and Brown. Here is the standard key:

The garage smelled of old gasoline and ambition. On the center stand sat a 1994 , a bike that had seen better decades. Its previous owner had tried to "simplify" things, leaving behind a bird’s nest of snipped copper and electrical tape.