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Old 02-19-2014, 05:32 PM
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Adding to existing fog lights

Hello all.

I have a 98 TJ that currently has the OEM fog lights on it. What I'm wanting to do is add a KC mounting bar to my stock bumper and a couple of extra lights.

Mounting Bar:
KC HiLiTES Bumper Hoop Bar With 2 -Tab Light Mounts, Front, Black Finish - KCH-7400

100w KC lights:
http://www.jeep4x4center.com/kc-hili...t-kch-151.html

I'm probably going to replace the original lights as well, although that may wait for a later date.

SO...

From reading up around here on fog lights, I hear that people recommend upping the wire size as the stock harness is rated for 55w lights. Then use the factory relay as the control side would stay the same.

I guess what I am asking is:

1. Can I run the new lights in parallel to the factory lights and then tie them together at the relay rather than replacing the factory wiring to the factory lights?

2. Is there an easier way to do this than what I am thinking? I would like 4 fog lights - where I live is pretty rural and it would be helpful not to hit critters at night. So I was thinking 2x55w when I replace the OEM lights, and add 2x100w.

I don't want to spend more then ~200 or so on 4 lights. Is there some kit that would do the same thing with the wiring harness included that can still use the factory control inside the cab?

3. Any suggestions on a good video as far as wiring the relay?

Thanks in advance.

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Old 02-19-2014, 05:51 PM   #2
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You cannot parallel the new lights on the factory wiring. The factory wiring is barely sufficient for the amperage draw of the factory lights. Use the KC wiring guide for your new lights and trigger the new KC relay with a power line that comes off the hot lead that goes to your existing lights. In the drawing below, you would delete the switch and instead run the green wire that is shown going to the switch to the hot side of your existing fog light wire (under the hood).

If you decide to replace the original lights later with higher wattage lights, you will also have to upgrade the factory wiring to larger wire.

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Old 02-19-2014, 06:08 PM
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Thanks for that. So - is there space for additional relays in the box then?

Also, what I meant by running parallel was to run new wires back to the relay and join them all together with the existing ones there. But if I'm understanding correctly, the relay probably isn't sized for that kind of draw either? Hence the supplied relay?
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Old 02-19-2014, 06:59 PM   #4
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Originally Posted by Once Far Off View Post
Thanks for that. So - is there space for additional relays in the box then?

Also, what I meant by running parallel was to run new wires back to the relay and join them all together with the existing ones there. But if I'm understanding correctly, the relay probably isn't sized for that kind of draw either? Hence the supplied relay?
The problem with doing it that way, is that the existing relay is supplied by an 18 gauge wire that comes from the power distribution center under the hood, then supplies the existing fogs with another 18 gauge wire. So even if you ran new wire back to the relay (and the relay was of sufficient size) you still haven't dealt with the undersize wire feeding the relay.

The best way to do this is to follw the wiring diagram in my last post. Just buy a bosch type relay and a relay connector (if you want or use spade connectors), screw the relay to a convenient place under the hood, and use an inline fuse wired direct form the battery. The wire from the battery to the relay, and from the relay to the lights should be minimum 14 gauge, and the wire from the existing light circuit to the relay, and relay to ground could be 18 gauge.

Wired this way, your new fogs would work along with the existing on the same switch. Note: My pair of KC lights came with a wire harness and a relay...not sure if the ones you're looking at do.
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Old 02-19-2014, 07:23 PM
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I see. Thanks for clearing that up!
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Old 02-19-2014, 07:54 PM   #6
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I put on new LED fogs last week that I wired directly into the stock system. Tuff led 27 watt for less than $50 on amazon. Less draw than stock so no wiring mods needed. They are almost too bright to be used when on the street, let alone fog. Had to aim them down to avoid getting flashed.


Attachment 785377

Drivers side is led. Pass side is stock.
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2006 Rubi LJ, 6 spd. OME 2.5" HD spring lift, 1.25" JKS BL, MML, discos, front & rear track bars, ZJ steering links, lots of LEDs, Shittybuilt front & rear bumpers, Novak transfer case cable.....blah blah blah
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Old 02-19-2014, 11:01 PM
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Thanks for that tip gnater76. I'm looking at them right now and reading the reviews.
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Old 02-20-2014, 09:11 AM   #8
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Thanks for that tip gnater76. I'm looking at them right now and reading the reviews.
I was impressed with the build quality, heavy gauge wiring, etc. they are pretty solid units. Can't speak to longevity of course. They have square ones too. Make sure and pay attention to beam pattern if you want scattered vs beam. I got the diffuse ones and they throw at least 270 degrees. Was too much light in heavy snow, have not tried them in fog yet. But at night they really add to the headlights. Stockers were completely washed out after I upgraded to Hella vision plus buckets with 100/80 H4 bulbs on the headlights. Couldn't tell when the fogs were on, not a problem anymore.
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Old 02-20-2014, 12:07 PM
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Awesome. I pulled the trigger on some last night. I figure at that price it's worth a shot.

Thanks again. I'll post a pic when I have them.
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Old 02-20-2014, 03:51 PM   #10
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Awesome. I pulled the trigger on some last night. I figure at that price it's worth a shot.

Thanks again. I'll post a pic when I have them.
I have the bar and bumper cover if you need it. PM me.

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