2017-2019 Superduty LED BLIS Tail Light Installation Instructions
Please note – these instructions are NOT originally created by BFC Automotive Lighting.
Tools Needed:
Key for spare tire. Usually inside the transponder key.
Spare tire lowering rod assembly, found somewhere in the truck. Usually under the back seat.
Ratchet, 1/4 drive
7mm socket
8mm socket
T20 torx socket or screwdriver
Door panel removal tool or prying device for small items / Straight pick
Small control tip flat screw driver
Masking tape and sharpie to label wiring
Black electrical tape, or whatever color works best
1. Remove both taillight assemblies using the 8mm socket and removing two screws per light. Pull light straight out, releasing two push clip fasteners. Set light aside, you will need parts from it later.
2. Lower and remove spare tire. This will make it easier to remove the harness.
3. Remove harness. Start with the driver’s side taillight and remove push fasteners and connectors until you get to the passenger side of the trailer hitch. Then do the passenger side. The connector for the bed light (if equipped) is different than all the other connectors. To remove, you must use a flat screwdriver to push the red part of the clip back towards the wire, and then push to release. Do not force it. Finish removing the harness to the two large connectors fastened to the trailer hitch.
4. Unpack new harness, and perform pinout procedure outlined in the video below (non BFC video – credit to James F in the video).
5. Install new harness the same way the old one came out.
6. Re-install spare tire.
7. Remove BLIS modules (if equipped) from the old taillights by removing four 7mm screws and removing the backing plate. Use the T20 torx to remove two screws from the BLIS module first, and then disconnecting the BLIS electrical connector. Pack up old taillights and store.
8. New taillight assembly – Install new electrical connector in the bracket of each new taillight. They are keyed, and only go in one way. Rotate 1/8 of a turn to lock in place. Install BLIS module my seating the electrical connector first, and reusing the T20 screws. Plug in the new taillight to the electrical connector. Install BLIS backing plate assembly to taillight reusing the four 7mm screws.
9. Install taillights by plugging in harness, seating two push fasteners, and reusing 8mm screws.
10. Test all functions.
11. (Where Or If Needed) Install BLUE BOX RESISTORS INLINE with the turn signal circuit (one wire connects to the positive wire going to the turn signals, the other black wire is grounded – this CREATES additional resistance to stop hyper flashing) OR use ForScan to eliminate hyper flash on the dash. Tutorial coming. The Blue Resistor boxes may NOT be required for your application and is optional.
