Universal 12V Pre-Wired Relay Harness for Motorcycles – KIT.WIRING

Looking to install long-range auxiliary LED lights on your motorcycle or other 12V electrical accessories without modifying the original power wiring? The KIT.WIRING is a universal pre-wired motorcycle relay harness designed to provide a dedicated power supply directly from the battery.

This complete wiring kit includes a 12V / 40A relay, a 15A fuse, a handlebar ON/OFF switch and two waterproof female connectors for wiring to your chosen accessories.

Unlike a wiring harness designed for one specific spotlight model, KIT.WIRING offers greater installation flexibility. Its connectors allow you to adapt the wiring to various compatible 12V electrical accessories, within the electrical limits of the harness.

By drawing power directly from the battery, the harness creates a separate power circuit independent of the motorcycle's CAN bus system. This is particularly useful on modern motorcycles with advanced electronic management.

Explore the KIT.WIRING Pre-Wired Motorcycle Harness

KIT.WIRING includes the main components needed to create an auxiliary electrical power supply on your motorcycle. Take a closer look at the relay, switch, waterproof connectors and battery connections.

Overview – Universal KIT.WIRING harness

Relay – 12V / 40A

Switch – Handlebar ON/OFF control

Waterproof connectors – Custom wiring

Wiring – 250 cm length

Battery connection – Positive and negative ring terminals

One Universal Wiring Harness for Your 12V Motorcycle Accessories

The main advantage of KIT.WIRING is its versatility. Although particularly well suited to installing auxiliary LED motorcycle lights, it is not limited to lighting applications.

It provides a protected auxiliary power supply for various compatible 12V electrical devices requiring relay-controlled operation, including:

• Auxiliary LED lights: ideal for powering a pair of long-range LED motorcycle spotlights, auxiliary lamps or other compatible 12V lighting equipment.
• Other 12V lighting accessories: compatible devices requiring a dedicated power supply.
• Motorcycle electrical accessories: equipment suitable for ON/OFF control through a relay.
• Custom installations: accessories with their own wiring that can be connected to the supplied connectors.

Connected accessories must be compatible with a 12V power supply, the switching arrangement and the electrical limits of the harness. The two outputs are controlled together by the same switch and cannot be switched independently.

Two Waterproof Female Connectors for Custom Wiring

KIT.WIRING is supplied with two waterproof female connectors designed to be wired to your accessories. The terminals allow the connections to be adapted to the power leads of your chosen equipment.

This design offers several practical advantages:

• Choose which compatible 12V electrical accessories to power.
• Adapt the wiring to equipment from different manufacturers.
• Use detachable connections protected against water splashes when correctly assembled.
• Avoid building an entire wiring harness with relay, fuse, switch and battery connections from scratch.

Please note: the harness is pre-wired, but the accessory connectors require final wiring during installation. It is not a model-specific Plug & Play spotlight harness.

Why Use a Relay Wiring Harness on a Motorcycle?

When an electrical accessory requires more current than a control circuit is designed to provide, a dedicated, protected power supply is a sensible solution.

KIT.WIRING separates the power required by the accessories from their electrical control circuit.

• Direct battery supply: a dedicated power circuit for the connected accessories.
• 40A relay: switches the accessory power supply without routing the load current through the handlebar switch.
• 15A fuse: provides overcurrent protection within its specified characteristics.
• ON/OFF switch: allows the connected accessories to be switched on or off.
• Waterproof connectors: support detachable connections suited to motorcycle use.
• Pre-wired design: reduces the amount of wiring work required during installation.

Important: the 40A figure is the relay's nominal rating, not the permitted current draw of the complete harness. The wiring kit includes a 15A fuse. Total accessory consumption must also remain within the ratings of the cables, connectors and installation.

Independent Power Supply for CAN Bus Motorcycles

Many modern motorcycles use electronically managed systems, often referred to as CAN bus. Certain lighting and power circuits are electronically monitored to detect faults or unusual electrical loads.

Connecting additional accessories directly to these circuits may trigger warning messages, protective shutdowns or electrical malfunctions.

With the KIT.WIRING motorcycle relay harness, accessory power is drawn directly from the 12V battery through a separate, fuse-protected circuit.

This arrangement allows additional electrical equipment to be installed without placing its power demand on the original lighting circuit. It is particularly useful for motorcycles equipped with multiplexed electronic systems.

Suitable Installation Principle for Many Motorcycle Brands

A dedicated relay-controlled power supply can be considered for many modern motorcycles, including models from:

• BMW Motorrad: GS, Adventure, RT and other models.
• KTM: Adventure and road motorcycles.
• Ducati: Multistrada and other modern models.
• Triumph: Tiger and touring motorcycles.
• Moto Guzzi: adventure and touring motorcycles.
• Aprilia: models with advanced electronic management.
• Harley-Davidson: recent models.
• Can-Am: Spyder and Ryker.

This list illustrates possible applications of a dedicated power circuit. It does not constitute a model-specific Plug & Play compatibility list.

Technical note: an independent power circuit does not eliminate the need to check relay control wiring. If an ignition-switched signal is taken from the motorcycle, the selected connection point must be suitable for its electrical architecture.

How the KIT.WIRING Motorcycle Relay Harness Works

KIT.WIRING is designed to power accessories directly from the 12V battery through its relay and fuse.

The handlebar ON/OFF switch controls the connected accessories. Depending on the chosen installation, the relay may also be controlled by a suitable ignition-switched positive signal to prevent the accessories from operating when the ignition is off.

On motorcycles with multiplexed electronics, the source of this control signal must be checked. An electronically monitored lighting circuit is not necessarily an appropriate relay trigger.

KIT.WIRING universal relay harness wiring diagram

Tips for a Neat and Reliable Installation

• Disconnect the battery before carrying out electrical work.
• Mount the relay in a protected area, such as under the seat or behind a fairing.
• Route the cables alongside the original wiring harness.
• Secure the cables with suitable ties without crushing them.
• Keep wiring away from heat, moving components and potential rubbing points.
• Connect the supplied female connector terminals carefully.
• Check connector sealing and locking after assembly.
• Verify polarity and total accessory consumption before powering the circuit.

Complete Your Setup with Long-Range Auxiliary LED Motorcycle Lights

Already have the wiring harness? Complete your installation with the lights! Pair your KIT.WIRING with our pair of long-range auxiliary LED motorcycle lights to create a dedicated lighting circuit with battery power, relay switching, fuse protection and handlebar ON/OFF control.

KIT.WIRING Technical Specifications

What's Included?

• 1 universal pre-wired electrical harness.
• 1 fitted 12V / 40A relay.
• 1 fuse holder with 15A fuse.
• 1 handlebar ON/OFF switch.
• 2 waterproof female connectors for accessory wiring.
• Positive and negative battery ring terminals.

Electrical accessories and auxiliary lights are not included.

Frequently Asked Questions About the Motorcycle Relay Harness

Is this harness only for auxiliary LED lights?

No. KIT.WIRING is a universal 12V electrical wiring harness suitable for various compatible accessories requiring a protected, relay-controlled power supply.

Are the accessory connectors already wired?

No. The kit includes two waterproof female connectors for custom wiring. Their terminals allow the connections to be adapted to the chosen accessories. The main harness is pre-wired, but final accessory connections must be completed during installation.

Can I connect LED spotlights from another brand?

Yes. The connectors can be wired to many compatible 12V LED spotlights, provided polarity, cable ratings and the 15A fuse protection are respected.

Is KIT.WIRING suitable for CAN bus motorcycles?

The accessory power supply comes directly from the battery, independently of the motorcycle's original multiplexed lighting circuits. If the relay uses a control signal from the motorcycle, the connection point must still be appropriate for the vehicle's electrical system.

Can the two outputs be switched separately?

No. Both outputs are controlled together by the same ON/OFF switch.

Does the 40A relay mean I can connect 40A of accessories?

No. The 40A rating applies to the relay itself. The harness is protected by a 15A fuse, and the permissible load also depends on the cables, connectors and installation conditions.

Are auxiliary LED lights included?

No. KIT.WIRING includes the wiring harness and its components. Our pair of long-range auxiliary LED motorcycle lights is available separately.

Do I need a professional to install it?

The pre-wired design simplifies installation, but connecting accessories and checking the electrical circuit requires motorcycle electrical knowledge. If unsure, seek assistance from a qualified professional.

TecnoGlobe Belgium – Motorcycle Electrical Accessories

Specialising in motorcycle electrical and electronic accessories, TecnoGlobe Belgium selects practical and versatile products for riders looking for reliable installation solutions.

With KIT.WIRING, you have a pre-wired electrical foundation for customising your motorcycle: direct battery power, a relay, fuse protection, handlebar control and waterproof connectors that can be adapted to your chosen accessories.

Whether you ride an adventure bike, road motorcycle or touring machine, this universal wiring harness offers a practical starting point for a neat, correctly rated auxiliary electrical installation.

TecnoGlobe Belgium – Motorcycle electrical accessories and LED lighting. Reference: KIT.WIRING.