I must assume you are talking about the back up lights you have to do it from inside the tailgate. you must remove the whole interior panel to get to it.I took it to the dealer and paid 60 bucks
cant open tailgate
If it is the same as my 2000 Navigator, you have to remove the inside panel of the tail gate, which is held on with hidden clips on the inside of the panel, a $10 tool at most automotive stores will assist in removing the panel. You must also remove the strap that is held on with 2 Philips screws. (it would have been easier for us if Lincoln had installed an access panel).
big hammer
To remove the rear door panel of a 2006 Lincoln Navigator, first, ensure the vehicle is off and the door is open. Remove any screws or fasteners securing the panel, typically found near the handle and along the edges. Carefully pry off the panel using a trim removal tool, starting from the edges to avoid damaging clips. Once loose, disconnect any electrical connectors and lift the panel away from the door.
The Fuel pump reset switch is located in the rear interior panel on the driver side by the tailgate. it is typically covered by a stock plastic panel. the switch is a simple push to reset switch.
On a 2004 Lincoln Navigator : NO , the passenger compartment fuse panel / Power Distribution Box is combined in the front passenger footwell , behind the kick panel
In a 2004 Lincoln Navigator, the OBD-II port is located under the dashboard on the driver's side. Specifically, you can find it to the left of the steering column, near the area where the lower dashboard meets the instrument panel. It may be necessary to remove a cover or panel to access the port.
On a 2004 Lincoln Navigator : ( NO , the passenger compartment fuse panel and the power distribution box are combined behind the kick panel in the front passenger footwell )
By removing some screws and/or bolts.
To remove the door panel on a 1998 Lincoln Navigator, start by disconnecting the negative battery terminal for safety. Use a flathead screwdriver to carefully pry off the plastic cover on the door handle and remove the screws beneath it. Next, remove any additional screws located along the bottom and sides of the panel, then gently pry the panel away from the door, taking care to disconnect any electrical connectors for power windows or locks before fully detaching it. Finally, lift the panel up to free it from the door.
On a 1998 Lincoln Navigator I believe it is in the front passenger footwell ( it might be behind an access panel )