Britax Heavy Duty 12V Dual Switch Wiring Harness Kit – Headlights & Worklights

Stop cobbling together wiring with scraps and hope. The Britax DLXWIRE-KIT-12V Heavy Duty Wiring Harness is a complete, purpose-built solution for cleanly and safely wiring both driving lights and worklights on your 12V vehicle — all from the one kit. Designed for the tradesperson, 4x4 owner, and serious touring rig builder who needs independent control over two separate lighting circuits without the rats' nest of DIY wiring, this harness has everything you need out of the box. No test equipment required, no head-scratching over wiring diagrams — just a fast, clean, professional result every time.

Two Lights. Two Switches. Total Control.

The defining feature of the DLXWIRE-KIT-12V over a standard single-switch harness is the dual independent switching setup — one switch for your headlight-activated driving lights, and a second separate switch for your worklights. This means:

• Your driving lights activate in conjunction with your headlights — automatically cutting out when you switch your headlights off, just as ADR compliance requires
• Your worklights operate on a fully independent switch — fire them up at camp, on a job site, or when reversing into a dark shed without needing your headlights on at all

For anyone running a dual lighting setup — say, a bull bar-mounted pair of driving lights plus rear or side-facing worklights — this is the proper way to do it. No compromise, no shared circuits, no confusing the two.

Relay-Protected — Your Vehicle's Wiring Stays Safe

The kit includes a 12V fused and resistor-protected 30A relay, which means your driving lights and worklights draw their current directly from the battery via the relay — not through your vehicle's factory headlight switch or any other lightly-rated OEM wiring. This is critical on modern 4x4s and utes where factory wiring has little headroom for additional load, and essential when running high-draw halogen or HID lights. The relay does the heavy lifting; your switch just tells it when to fire.

Universal Fit — Works on Virtually Any 12V Vehicle

The DLXWIRE-KIT-12V is designed for universal fitment across both positive and negative switched headlight systems, covering the full range of Australian vehicles — modern Japanese utes and 4WDs, older vehicles with positive-switched headlights, Euro vehicles, and everything in between. The included quick-fit H4 headlight adaptor plugs straight into the factory headlight connector on most vehicles for a clean, solder-free connection. If your vehicle doesn't use H4 connectors, simply remove the adaptor and wire directly — the harness accommodates both approaches.

Complete Wiring — Everything Included

This isn't a relay and a switch — it's a genuinely complete kit. Everything needed to fully wire both lighting circuits is inside the box:

• All wiring for lamps, including LED position light circuits
• 30A fused and resistor-protected relay
• Dual illuminated surface-mount dash switches for easy, clean dash installation
• H4 quick-fit headlight adaptor (removable for non-H4 applications)
• Switch indicator lighting — red for power on, green for driving lights on, so you always know what's live at a glance

Illuminated Dash Switches — Always Know What's On

The included surface-mount dash switches are illuminated for clear status indication — red signals power is on, green signals driving lights are active. No more second-guessing whether your lights are still on when you park up. The switches are designed for easy, clean installation into any dash or switch panel, and the surface-mount design means no complex cutout work required.

Britax — Trusted Australian Brand

Britax has been supplying the Australian automotive, transport, and emergency services industries with quality electrical and lighting products for decades. The DLXWIRE-KIT-12V is built to the same standard as the rest of the Britax range — heavy-duty components, reliable connections, and a design that's been proven in the field across everything from tradie utes and farm vehicles to serious 4x4 touring builds.

Technical Specifications

Ideal for: Dual cab utes, 4x4s, and work vehicles running both a set of driving lights and a separate set of worklights or reverse lights — tradies, farmers, touring rigs, and anyone who needs two independently switched lighting circuits done properly without cutting corners on the wiring.