Fog Light Mod - Separate on/off via upfitter

[AndrewF]

In an effort to have more light output when driving on rural roads, I made it possible to have my FOG lights on, even when my high beams are on.

For some reason, most manufactures make it so that when you turn your high beams on, your fog lights go off. This reduces the amount of light closer to the vehicle and sides of the road.

I connected the output wire from UpFitter #1 to one of the passthru wires. I then ran a wire from the passthru wire down to my fog light harness under the truck. I soldered in two diodes. One diode keeps the power from the upfitter going back to the BCM and thereby possibly confusing it. The second diode, keeps power from the BCM going back to the upfitter. I dont believe this one was needed, but since I had a pack of 25 diodes, I put it in.

The end result is beautiful.
1) I can have my fog lights on with no parking lights
2) I can have my fog lights on with my high beams
3) I can still leave it all auto and have my fog lights come on/off as it was from the factory.


Here are some pictures of the wiring. You will splice your power feed into the brown/yellow stripped wire after the harness.




Peel back the tape and loom to expose the two wires. Black is ground. You want the striped wire.





Cut the wire and cut about a 1/2 piece out to make room for the diode and solder it in. Be sure to orient it the correct direction.




Next tape over the end closest to the connector, so that when you solder the feed diode in, you dont cause the annode sides to touch and bypass the purpose of the diodes.

Then solder in your feed wire with its own diode on it.




All done. Tape it up, put the loom back and cable tie all wires.

[AndrewF]

Here are some sample photos. Unfortunately, the iphone camera doesnt really show the difference as much as the human eye can tell.

First photo is high beams only.



This photo is highs, with the fogs on.



Can definitely see more light down load on the gravel, as well as on the sides, the bushes by the fuel tank, and the lower part of the bush to the left.

It was late, so I didn't take it for a drive in the dark to test it.

Total cost of the mod:

Time: 60 minutes
Diodes: $3
Split Loon: $2
Wire: (already had)

[F350SD]

that's a cool idea. my innate fear of screwing something up that can't easily be fixed usually kicks in when I read stuff like this but, with your write-up and photos, I might just have to try it. good post.

[J-MAN]

could you give a part number on the diodes you used. I got some from radio shack and they suck! LOL.

[matty21]

very intuitive. i must say .this will be something i will look into shortly . very nice detailed writeup. and good clean install. kudo's.
on my last two harley trucks i had extra 6" lights : behind the grill in my 06 an on my bull bar on my 08 but never liked the look of them this is great

[mysticblu999]

This is a great idea!