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Old 03-02-2011, 01:19 PM   #1
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Fog light swap

I've got a pair of Harbor Freight "off road distance" lights that I'd like to put in place of my factory fogs. I'm not sure what the factor fogs are rated at, but the ones I've got are rated at 100W each.

Can I just cut the plug off the factory light and wire it to the new lights so I keep the factory wiring and switch?

My concern is the new lights drawing too much power for the factory setup.

Link to lights that are going to be used:

Off-Road Long-Range Truck Light System

I know it comes with the wires and a switch for them, but I'd rather keep the factory switch.

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Old 03-02-2011, 01:23 PM   #2
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If you get any fog in your area you will want REAL fog lights-which are yellow...'driving' lights or long distance lights are white....FYI....
but if your lights are both 12V you shouldn't have any trouble wiring them right in to the factory harness.

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Old 03-02-2011, 01:31 PM   #3
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I'm not worried about the color of the lights. I got exactly what I wanted and I know full well what they are. That has nothing to do with what I'm getting at.

I'm just concerned with the wiring and switch being able to handle the extra draw. Its even been suggested that I use a relay because of the 100W power rating.

Does anyone know what the factory fogs are rated at? And does anyone know what the factory wiring/switch can handle without having negative effects (low power delivery, overheated wires, etc)?
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Old 03-02-2011, 02:19 PM   #4
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Factory bulbs are 55W. Factory setup uses a pair of relays. One to supply power, the other shuts it down when high beams are on.
Don't know gauge of stock wires, probably 16. About 8 amps per side, 16 through the relay. Should hold.

Hook them up temporary, turn them on for five minutes. Feel if the wires are getting hot.
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Old 03-02-2011, 02:45 PM   #5
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Quote:
Originally Posted by NHrubicon View Post
If you get any fog in your area you will want REAL fog lights-which are yellow...'driving' lights or long distance lights are white....FYI....
but if your lights are both 12V you shouldn't have any trouble wiring them right in to the factory harness.
I guess this is what I'm thinking about your 12v statement:

I've got a 12v light in my kitchen. Its rated at 60w max. I put a 100w bulb in there instead. Both bulbs are 12v, but one is near double the max rating.

Good idea? Probably not.

Quote:
Originally Posted by sparky View Post
Factory bulbs are 55W. Factory setup uses a pair of relays. One to supply power, the other shuts it down when high beams are on.
Don't know gauge of stock wires, probably 16. About 8 amps per side, 16 through the relay. Should hold.

Hook them up temporary, turn them on for five minutes. Feel if the wires are getting hot.
Beautiful. Exactly what I was looking for!

Would it cook the relay?
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Old 03-02-2011, 02:58 PM   #6
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I personally do not use factory wiring for any aftermatket products. I wire all these items through independent relays and use factory wiring to trigger the relay.
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Old 03-02-2011, 03:14 PM   #7
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Quote:
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I personally do not use factory wiring for any aftermatket products. I wire all these items through independent relays and use factory wiring to trigger the relay.
Yeah, I gotcha. I should have just did a quick search.

Instead I started a thread before searching, which is foolish of me.

http://www.wranglerforum.com/f5/off-...ing-39442.html

http://www.wranglerforum.com/f5/new-...ion-61345.html

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Old 03-02-2011, 10:06 PM   #8
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Well at least your asking a good question. I can see a guy smoke testing the wires and switch and THEN looking up wattage answers! so dont beat yourself up =)
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Old 03-03-2011, 10:43 AM   #9
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I just replaced my stock foglights with Hella 500FF, 55w driving lights but I wasn't too concerned since the stock fogs are also 55w. That being said, I would definitely run a relay for 100w bulbs since the wiring diagrams show the foglight wiring to be 18ga. In my opinion, that is not adequate for 100w bulbs and I would rather see a minimum of 16ga, if not 14ga. Also bear in mind that the wiring diagrams show that the two 18ga wires split off from a single 18ga wire; I'm not sure how long that single 18ga wire carries the power, but I really wouldn't like to see almost 17A of current flowing through a single 18ga wire for any real length. Jeep even opted for a 16ga conductor on the 60w high beam headlight circuit so that should tell you something. This is only my opinion, but when I go to install my 100/55w H4 conversions this weekend they will be supplied with power from relays and 14ga wiring.

-Wes
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Old 03-03-2011, 11:28 AM   #10
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yes, you need a relay. you can trigger the lights with the stock system, but you can't just hook up 100W to 55W wiring. it will burn up.
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Old 03-03-2011, 11:44 AM   #11
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Since the Texan checked the diagrams for us and found 18 gauge in there, then I'll agree. Limit that circuit to 55W bulbs, if you want bigger then run a heavier setup.
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Old 11-11-2011, 10:06 AM   #12
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Quote:
Originally Posted by UnlimitedLJ04 View Post
yes, you need a relay. you can trigger the lights with the stock system, but you can't just hook up 100W to 55W wiring. it will burn up.
Yep, that's what I found out.
Quote:
Originally Posted by sparky View Post
Since the Texan checked the diagrams for us and found 18 gauge in there, then I'll agree. Limit that circuit to 55W bulbs, if you want bigger then run a heavier setup.
Absolutely.

My wife wants both the factory fogs and the extra set, so that's what will be done.

I know its been quite some time since this was started, but sometimes life keeps you from things.

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