2004-2008 Ford F-150 & 2006-2008 Lincoln Mark LT LED Dual Projector Headlights Installation Guide

Important: This online guide is a product-side overview for the matched RIGNOX product. It covers what is in the box, how the kit is wired, and what to check before and after fitting. Confirm hidden vehicle-side fasteners, trim clips, and wiring access points on your exact vehicle before removal.

Safety warning: Do NOT use dielectric grease or weather-sealing grease on connectors or sockets. Grease can cause connection problems and may affect warranty coverage.

Matched product

• Product: 2004-2008 Ford F-150 & 2006-2008 Lincoln Mark LT LED Dual Projector Headlights Assembly
• Product type: headlights
• SKU: H-F150-04
• Fitment: 2004-2008 Ford F-150 (11th Generation, P221) — XL, XLT, Lariat, STX, FX2, FX4, King Ranch and Harley-Davidson — and 2006-2008 Lincoln Mark LT in both 2WD and 4WD. Does not fit the 2004 Ford F-150 Heritage, which carried the previous body and uses a different lamp.
• Lighting: White daytime running light, amber sequential turn signal, amber side signature at the outer corner. No startup animation on this model.
• Product page: View matching RIGNOX product details

Product reference images

Reference photography for this kit is being added. Until it appears here, use the image gallery on the product page to compare lamp shape, rear housing, visible plug layout, and lighting functions before final assembly.

Product image checkpoints

• Lay both assemblies out and identify left from right before anything comes off the truck. The Lincoln Mark LT takes the same parts as the F-150, so there is no separate left/right rule for it.
• Match each supplied connector to the corresponding vehicle connector and confirm the lock tab seats fully before reinstalling trim.
• Compare the rear of each new assembly against the original you just removed, one side at a time, rather than removing both first.
• If the kit includes a decoder, resistor, control module, or relay, secure it away from heat, moving parts, water paths, and sharp metal edges. Do not add universal electrical parts unless support confirms they are needed.

Product notes

• The daytime running light is white. The turn signal sweeps outward in amber sequence rather than blinking all at once.
• This model does not run a startup animation on ignition. If you were expecting one, that is the product, not a fault.
• Original vehicle trim, clip style, and fastener locations can vary by year, trim, and previous repairs. Remove panels slowly and verify each fastener before pulling.
• Road-lighting compliance notes are product specific. Review the matching RIGNOX product page for the exact language for this item.

Before you begin

• Confirm the exact product: Check that both assemblies are present and undamaged, and that the lens and housing match the product page images, before removing anything from the truck.
• Confirm you are not on a Heritage: A 2004 F-150 Heritage uses the previous-generation body and a different headlight. Check the model badge and the body style before ordering or installing.
• Work powered down: Park on level ground, switch the vehicle off, and disconnect the negative battery terminal when handling wiring.
• Work one side at a time: Leaving the opposite side assembled gives you a reference for connector routing and lamp seating.
• Protect body panels: Use clean towels or masking tape near painted edges around the hood, grille, bumper edge, or fender liner area.
• Do not force clips: If a lamp or trim panel does not move, stop and look for another fastener or locating pin.
• No grease on connectors: Do not apply dielectric grease or weather-sealing grease to connectors or sockets.

Tools and supplies

• Trim removal tool or panel clip tool
• Metric socket and ratchet set; verify exact sizes on the vehicle before removal
• Phillips and flat screwdrivers
• Clean microfiber towels and masking tape
• Electrical tape and zip ties for securing included harnesses only
• A wall or flat vertical surface for beam-pattern checking

Remove the original headlights

1. Open the hood and expose the lamp retainers: Locate every retainer holding the headlight on the side you are working on before releasing any of them, and note how each one is oriented so it goes back the same way.

2. Release the headlight assembly: With the retainers clear, draw the headlight straight forward off its locating pins. Do not twist it or lever it against the fender — if it will not come, a retainer is still engaged.

3. Disconnect the factory wiring: Support the assembly, press or release each locking tab, and separate the connectors. Pull on the connector body, never on the wires.

4. Repeat on the opposite side once the first side is fully installed and tested.

Install the RIGNOX headlights

1. Connect the wiring: Plug the RIGNOX harness into the factory connectors for that side. The kit is plug-and-play into the factory harness with integrated anti-flicker decoders, so no cutting, splicing, or added resistors should be needed. Confirm every plug is fully seated and locked.

2. Test before you close anything up: With the lamp still loose, switch on and confirm low beam, high beam, the white daytime running light, and the amber sequential turn signal. It is far easier to fix a connector now than after the assembly is bolted in.

3. Seat and secure the headlight: Guide the assembly onto its locating pins, check the gap against the fender and hood, then refit the retainers. The lamp should sit flush without being forced.

4. Repeat on the opposite side, then reconnect the negative battery terminal.

Electrical and function test

1. Confirm low beam and high beam operate on both sides.
2. Confirm the white daytime running light, position lamps, amber sequential turn signal, and hazard flash on both sides.
3. Check for dashboard warnings, flicker, or hyperflash before reinstalling final trim.
4. Verify beam aim against a flat vertical surface so the cutoff is safe and even.

Final check

• All connectors are locked, dry, and routed without tension.
• Included modules or extra harnesses are secured away from heat, water paths, moving parts, and sharp edges.
• Both headlights sit flush with even body gaps and properly seated seals.
• All lighting functions pass on both sides.
• No warning lights, flicker, hyperflash, abnormal heat, moisture issue, or loose wiring remains after a short check drive.

Troubleshooting

• One lamp does not turn on: Recheck the main connector lock, related fuse, and battery connection.
• One function does not work: Verify the connector is fully seated and that both sides are wired the same way.
• Warning message, flicker, or hyperflash: Confirm any included decoder or relay is connected and secured.
• The lamp will not sit flush: A locating pin is likely not engaged. Back the assembly out and reseat it rather than tightening the retainers down onto it.
• Moisture appears: Light condensation may clear as the lamp warms. Heavy or persistent moisture should be documented with photos before continued use.
• Beam pattern is too high or uneven: Recheck lamp seating first, then adjust aim on a flat surface.

Need help?

If the original lamp, vehicle connector, or included harness does not match what you received, stop before modifying wiring. Contact RIGNOX support with your order information, vehicle year/model/trim, and clear photos of the connector area, rear housing, beam output, and installed front-end gap.

End of installation guide. (c) RIGNOX - All Rights Reserved.