ZUMA 125 HONDA RUCKUS SWAP WIRING

This page is a complete how‑to guide for anyone performing a Yamaha Zuma 125 engine swap into a Honda Ruckus. It covers the full custom GOVE MINI MOTO wiring harness layout, including the deleted OEM components such as the starter cutoff relay, sidestand switch, lean sensor, headlight AC relay, and the Zuma 125 instrument cluster. If you're searching for Ruckus swap wiring, Zuma 125 swap help, or a Honda Ruckus engine swap blog post, this guide explains the simplified electrical system used on real builds.

Power System

Battery → Main Fuse → Constant 12V Rail

• B1 → F1 (15A) → RED rail
• RED rail feeds:
  • Reg/Rec DC output
  • Starter relay (input)
  • Ignition relay (pin 30 + 86)
  • Any constant accessories

Ignition Switch & 4‑Pin Relay (Ground‑Triggered)

This setup is common in Honda Ruckus wiring modifications and works perfectly with a Zuma 125 swap. The Ruckus ignition switch provides ground to energize the relay.

• 30: Constant 12V (RED)
• 87: Switched 12V OUT (BROWN rail)
• 86: Constant 12V (RED)
• 85: Ground from Ruckus ignition switch

Key ON → ignition switch grounds relay → BROWN rail becomes live.

Kill Switch (OEM Zuma 125 Style)

• RUN: circuit open
• OFF: ignition/ECU IGN line grounded → engine stops

This is the same kill‑switch logic used on the Yamaha Zuma 125.

Key‑ON 12V Rail (Brown)

The BROWN rail powers:

• ECU / aRacer
• Headlight + tail light
• Brake switch
• Starter button logic
• EFI System
• Any switched accessories

Headlight System (LED, DC Only)

Former Headlight Relay Connector

• Pin 1: Brown
• Pin 2: Blue
• Jumper Brown → Blue
• Pins 3–4 unused

This makes Blue = key‑ON 12V. This is a common mod in Ruckus swap wiring harnesses.

Handlebar Switch

• IN: Blue
• OUT LOW: White
• OUT HIGH: Yellow

LED Headlight(s)

• White → Low beam +
• Yellow → High beam +
• Black → Ground

Starter System (Ground‑Triggered Coil)

Starter Relay

• Large Red → Battery
• Large Black/Red → Starter motor
• Coil + → 12V from brake lever
• Coil – → Ground from momentary starter button

Starter Logic

1. Brake lever pulled → sends 12V to relay coil +
2. Momentary start button pressed → grounds coil –
3. Relay energizes → starter motor cranks

Regulator / Rectifier (C7)

• Yellow / Yellow / Yellow → Stator AC
• Red → Constant 12V rail
• Black → Ground

Tail / Brake Light (C8)

• Brown → Tail +
• Yellow/Green or Yellow/Red → Brake +
• Black → Ground

Ground System

• All Black wires → Ground bus → Frame
• Use short, clean, star‑pattern grounds

Deleted OEM Components

These components are removed in the GOVE MINI MOTO Zuma 125 to Honda Ruckus swap harness:

• Starter cutoff relay
• Sidestand switch
• Lean / tip sensor
• Headlight AC‑trigger relay
• Instrument cluster

System Summary

• RED: constant 12V
• BROWN: key‑ON 12V (via ignition relay)
• Blue: headlight feed
• Kill switch grounds ignition to stop engine
• Starter coil: brake lever 12V + momentary ground
• Headlight: Brown → Blue jumper → bar switch → LED
• No interlocks, no AC lighting, no OEM safety relays