Installing Factory Fog Lights on a pre-wired TJ

Discussion in 'TJ How-to Guides' started by Chris, Jan 30, 2017.

  1. Chris

    Chris Administrator
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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:
    601b83d1.jpg

    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)

    024-1.jpg

    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.

    029-1.jpg

    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:

    034-1.jpg

    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:

    045.jpg
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  2. Joprince911

    Joprince911 Member

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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?
     
  3. Kevin E

    Kevin E TJ Enthusiast
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    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.
     
  4. Chris

    Chris Administrator
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    Have you checked to see if there's a fuse in place in the fuse box?
     
  5. Bigcanoe

    Bigcanoe New Member

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    You can check the connector itself with a multimeter to see if its getting juice.
     
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  6. Chris

    Chris Administrator
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    Yep, or a test light!
     
  7. Marc L

    Marc L Member
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    Did the 2001 come with wiring for fog lights as well?
     
  8. Chris

    Chris Administrator
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    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).
     
  9. Marc L

    Marc L Member
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    Thank you!
     
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  10. TJ Jonny

    TJ Jonny Member

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    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?
     
  11. Chris

    Chris Administrator
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    I would have thought it was for the rear wiper or defrost. The only other thing it could be for is fog lights.
     
  12. TJ Jonny

    TJ Jonny Member

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    It's not the wiper and defrost, I'll have to figure it out and report back.


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  13. Chris

    Chris Administrator
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    Must be fogs then. But let us know what you find!
     

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