Baja Designs Ford OnX6/S8 Upfitter Wiring Harness - 640094

The Baja Designs OnX6/S8/XL Upfitter Wiring Harness (Part # 640094) is a purpose-built wiring solution designed specifically for vehicles equipped with factory upfitter or uplifter switches — most notably the Ford Raptor and other Ford trucks that come with factory-installed auxiliary switch provisions. If you're running Baja Designs OnX6, S8, or XL-series LED lights and want a clean, straightforward installation that ties directly into your vehicle's factory switch infrastructure, this harness is the missing link between your lights and your cab controls.

Key Features & Benefits

• Designed for Factory Upfitter Switch Integration: This harness is built specifically for vehicles with factory upfitter/uplifter switches, allowing you to control your Baja Designs LED lights directly from the switches already in your cab — no aftermarket switch panel required.
• Simplifies LED Light Installation: According to Baja Designs, this harness simplifies the installation of their OnX6, S8, and XL-series lights, reducing the complexity and time involved in wiring auxiliary lighting to your truck.
• Compatible with Switch Panels: Beyond the factory upfitter switches, this harness can also be used to integrate aftermarket switch panels such as sPOD or other switch panel units, giving you flexible control options for your lighting setup.
• Three-Pin Connection Terminal: The harness uses a single three-pin connection terminal with splice connectors, providing a secure and reliable electrical connection.
• Universal Design for OnX6/S8/XL Lights: Classified as a universal harness, it works across Baja Designs' OnX6, S8, and XL light series — making it a versatile wiring solution if you have or plan to expand your Baja Designs lighting setup.
• Pairs with 2-Light Splitter for Dual-Light Setups: If you plan to run two lights on a single harness, Baja Designs specifies that you'll also need the OnX6/S8/XL 2-Light Splitter (PN: 613608), sold separately. This keeps your wiring tidy without running separate harnesses for each light.

Specifications

• SKU / MPN: 640094
• Application: OnX6, S8, XL (Baja Designs LED light series)
• Harness Description: 1 Upfitter Harness
• Terminal Connector: 1 Three-Pin Connection
• Terminal Type: Splice Connectors
• Switch Included: No
• Mounting Hardware Included: No
• Universal or Specific: Universal
• Wiring Harness Included: Yes

Fitment

This harness is classified as a universal wiring harness within the Baja Designs OnX6/S8/XL ecosystem — meaning it is compatible with any vehicle that has factory upfitter or uplifter switches and is running Baja Designs OnX6, S8, or XL-series lights. Multiple sources specifically highlight the Ford Raptor as a primary target vehicle, given its factory-equipped upfitter switch provisions. Other Ford trucks with factory auxiliary/upfitter switches are also relevant candidates.

This harness is designed to work with Baja Designs OnX6, S8, and XL-series LED lights only — it is not intended for use with other light series or competing brands. If you are unsure whether your specific vehicle's upfitter switch setup is compatible, contact our team before ordering.

What's in the Box

• 1x Baja Designs OnX6/S8/XL Upfitter Wiring Harness

Note: Mounting hardware and switches are not included. If you need to run two lights on a single harness, the OnX6/S8/XL 2-Light Splitter (PN: 613608) must be purchased separately.

Why Buy from ThreePiece.us

• Free Shipping on Every Order: Every order ships free — no minimum required, no surprises at checkout.
• Affirm Financing Available: Break your purchase into manageable payments with Affirm financing, available right at checkout.
• Expert Fitment Help: Not sure if this harness works with your specific Ford truck or lighting setup? Our team is here to help you get the right part before you order — not after.

Frequently Asked Questions

Q: What Baja Designs lights does this harness work with?
A: This upfitter wiring harness is designed for use with Baja Designs OnX6, S8, and XL-series LED lights. It is not specified for use with other Baja Designs light families.

Q: Do I need any additional parts to run two lights off this harness?
A: Yes. Baja Designs specifies that if you plan to connect two lights to a single harness, you will also need the OnX6/S8/XL 2-Light Splitter (PN: 613608), which is sold separately.

Q: Does this harness include a switch?
A: No — this harness is designed to connect to your vehicle's existing factory upfitter/uplifter switches or to an aftermarket switch panel such as sPOD. No switch is included in the box.

Q: Can I use this harness with an aftermarket switch panel instead of factory upfitter switches?
A: Yes. Baja Designs states this harness can be used to integrate switch panels such as sPOD or other switch panel units, so it is not limited to factory upfitter switch applications.