I started to do the fog light mod on my 99 expedition so i could have them on with the parking lights only and I cant figure out which wires i need. I have the auto lights with the roller dimmer like switch and there's 3 plugs on the back. There are no numbers on any of the plugs. There's 11 wires between the 2 main plugs I don't have a black and white wire in the 11. There is a smaller one with 5 wires going to it 2 go into the same spot with 2 white with black wires in it. Do i need to hook one of those white and black wires to the brown wire? I already filed the ramp in the switch. I have been searching for 2 days trying to figure out which wires i need. Any Information would be greatly appreciated.

 

the following is the eceltrical part from the full fog light mod post. hope this helps you. From what i understand the number on the wires may vary but at any rate you should still use the bron and white/black wires to jump.




Part 2 - Electrical Modification: The Headlight Switch Wiring
This is the easiest part. If you look at the wire connector that plugs into the back of the headlamp switch, there should be 9 wires of varying colors. Although the connector has space for 12 wires, only 9 of them are used. Also, on the wire side of the connector (as opposed to the switch side of the connector, which is the side you would insert into the switch), the wire positions are numbered.
Okay, find the #2 wire (white/black) and the #12 wire (brown) that is attached to the connector and splice them together. That's it! No cutting needed! Don't forget to electrical tape/insulate your splice well.
NOTE: For Canadian owners, after performing the electrical splice described above, you shoul cut the #2 wire away from the switch connector to achieve the results below. Also keep in mind that this addition step is my best guess at a solution, but shoul be considered untested. If you try this on a Canadian 2000 Lightning, please let me know your results.
Results at this point:
In addition to working with the autolamps, you should now be able to activate your foglamps with just your parking lights. Make sure to test everything BEFORE popping the switch console back into the dash... much easier this way in case somethig is/goes wrong.


here is the full link if you want it:

https://www.ford-trucks.com/forums/2...light-mod.html