Wiring Harness & Electrical Harness Kits for Every Application

Wiring Harnesses by Application

Rather than one generic category, we've split our range by what drivers are actually installing, since a lighting harness and an ignition harness solve very different problems.

Lighting & Off-Road Accessories

For spotlights, light bars, and driving lamps, a dedicated harness prevents overloading your factory wiring and gives you a proper relay-controlled circuit.

• King's spotlight wiring harness kits are built for popular off-road lighting brands
• Lightbar wiring harness options with in-cab switch and relay included
• Headlight relay harness kits that reduce voltage drop to factory headlights, a common upgrade for older vehicles running dim OEM lighting

Audio & Infotainment

Aftermarket stereos and amplifiers rarely match factory wiring pinouts, which is where a proper harness earns its keep.

• Car audio wiring harness adapters that connect aftermarket head units to factory looms without cutting original wiring
• Amplifier and speaker-specific looms for larger sound system installs
• Plug-and-play wiring harness kits designed to keep steering wheel controls and factory chimes working after an upgrade

Ignition & Switch Circuits

Ignition and switch wiring see constant use, which makes it one of the more common failure points over a vehicle's life.

• Ignition switch wiring harness kits for worn or melted factory connectors
• Relay-integrated harnesses for high-draw ignition circuits
• Replacement looms matched to specific ignition barrel and switch configurations

Signs Your Existing Harness Needs Replacing

A failing harness rarely announces itself clearly, which is why so many electrical faults get misdiagnosed as something else entirely.

1. Intermittent faults that appear and disappear with vibration, cornering, or temperature
2. Visible chafing, melted insulation, or exposed wire along the loom
3. Corrosion at connector points, especially in vehicles exposed to moisture or off-road conditions
4. Accessories that worked fine after installation but have since become unreliable
5. A burning smell without a clear source, often the first sign of an overloaded circuit

Choosing Between Factory Match and Universal Kits

A car electrical harness built to match your factory connector plugs straight in with minimal cutting or splicing, and is the safer option if you're not confident with wiring diagrams. Universal electrical harness kits cost less and suit custom builds, off-road accessories, or vehicles where a factory match doesn't exist, but they do require proper crimping and, ideally, some wiring knowledge. Either way, running a new circuit through a relay rather than directly off a switch protects both your factory wiring and whatever you're installing, and it's a step worth taking even if it adds a small extra part to the order.

Installation Support and Compatibility

Sending us your vehicle details and the accessory you're fitting lets our team confirm connector type, circuit rating, and whether a relay is needed before you order. This matters most on lighting and audio installs, where the wrong harness means a return trip rather than a quick fix, and it costs nothing to check beforehand.