Installing factory fog lights on a pre-wired TJ

Chris

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This writeup will detail the installation of factory fog lights on a 2005 TJ X that was pre-wired for fogs from the factory. The majority of 2005 and 2006 X models came with the fog harnesses under each fender. Fogs were an added option on the X model and were easily added if ordered. This writeup will expand on truckin88's previous thread about factory fogs.

The first thing you need to do to determine if you can easily add factory fogs without having to run any wires is to check under each fender to see if you have the factory harness and plug. The plug will be under each fender towards the front of the grill and will look like this:
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If you see this, you are pre-wired and can add fog lights easily.

Things you will need:
  1. Multifunction switch with factory fog light option
  2. Factory fog relay
  3. Fog lights (I went with the factory fog lights, but any others would work as well)
First thing you need to do is take apart the steering column that houses the headlight switch. You will need to install the new multifunction headlight / fog switch. There are 2 phillips head screws holding the housing together underneath the steering wheel seen here: (It's easiest to get them out with the steering wheel all the way up)

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Once you have the column apart you there will be 2 harness plugs that need to be removed from the switch, one for the headlights, and one for the wiper. There are orange clips on each one that need to be released before they will unplug. They may be easier to remove once you pull the 2 T20 Torx screws holding the unit down.

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Once you have the old switch out you will need to remove the wiper portion and a relay on the back of the unit. The wiper portion has 2 T10 Torx screws that holds it on. Both parts will be added to the new multifunction switch.

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Just reinstall the new switch and put the steering column back together and you're ready to move on to the next step.

You will need to install the fog switch relay that is located in the fuse box under the hood.

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Last step is to plug in the fogs to the harness under each fender! Jeep must have made a change in 2005 to the factory fog plug because the lights I have were from 2004 and the plugs wouldn't mate. The plugs on the lights and under the fender are actually identical, shown here:

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All you need to do at this point if you're in this situation is clip the plug off the fog lights and attach wire clips to each wire. Make sure you have the ground and power wires matched correctly and plug each into the factory plug under the fender.

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Wrap each plug well with electrical tape to keep water out.

That's the extent of it, now you have factory fogs or aftermarket fogs without having to run any wires. I chose to go with factory fogs because I like the factory look. Obviously there are far better fogs on the market. A bonus to going this route is the factory indicator in the guage cluster:

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all my wiring is there and hooked up but not working. Do you think it could be a bad relay under the hood?
 
I have wires going to one of my blanks on switch pod but can't find it up front. I thought it was for fog lights but who knows.
 
Did the 2001 come with wiring for fog lights as well?

The later 03-06 models did for sure, but I'm not sure about the 97-02 models. It's easy to check, just look under the fenders for wiring and two empty plugs (one on each side).
 
I have the same thing in my SE. I noticed this when I wired the rear wiper and defrost last week for the hardtop I bought.

Anyone know what this wiring is?

I would have thought it was for the rear wiper or defrost. The only other thing it could be for is fog lights.
 
Yea I read a few threads and the driver side "just unplugged" but the passenger side just will not budge, seeing if anyone had a trick I am missing to get this one unplugged?

Oh! It must just really be stuck on there. Not sure how to get that off other than a lot of force.
 
Literally just got if off, let it soak with WD-40 overnight, small flat head to help release the clip and pliers to get a good grip and wriggle it till it came off. Why do some of the small things take so much effort? But saved the stock plugs and no wire cutting. Now to remove the front bumper.
 
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Ok, odd question. I bought my 2000 Sahara used. It has the toggle switch for fog light but I can't see any wiring or a relay in the relay box. Anybody know of a way to wire up fog lights to the original switch. BTW, I don't have the connector/plug in Chris's first picture. Thanks if you know or can at least help. I work in electronics but can't find where the wires are going from the switch. Seems like it should be easy.
 
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Ok, odd question. I bought my 2000 Sahara used. It has the toggle switch for fog light but I can't see any wiring or a relay in the relay box. Anybody know of a way to wire up fog lights to the original switch. BTW, I don't have the connector/plug in Chris's first picture. Thanks if you know or can at least help. I work in electronics but can't find where the wires are going from the switch. Seems like it should be easy.

You could definitely make your own wiring harness, but the more factory way to do it would be to source the factory fog light harness from a TJ that had stock fog lights.
 
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