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Unread 12-30-2012, 09:08 AM   #1
jerretxx
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Join Date: Dec 2012
Location: concord, nc
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installing fog lights on my girlfriends 05

Hey guys, I bought my girlfriend fog lights for her 05 grand cherokee. I found a site showing how to install these lights, it is very simple.
http://www.jeepforum.com/forum/f140/...nstall-867728/

However, has anyone ran a jumper wire to the tail lights to activate these? Id love to do that rather than pay our local dealership $100.00 to do so.

If you could tell me how, or message me a step by step how to that would be great!

Thanks!

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Unread 12-30-2012, 10:38 AM   #2
colinzj
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Don't run a jumper to the tail lamps. Please, for the love of God, don't run a jumper to the tail lamps.

They're called fog lights for a reason. You're not supposed to run them except in fog.
Used in clear conditions, fog lights dangerously decrease your night vision. In fact, that's why it's illegal almost everywhere to use them in clear conditions.

When she plows into a deer/tree/grandma and the cops/insurance finds out the fogs were on, you will have a bad day.
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Unread 12-30-2012, 12:05 PM   #3
Robb286
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Quote:
Originally Posted by colinzj
They're called fog lights for a reason. You're not supposed to run them except in fog.
Used in clear conditions, fog lights dangerously decrease your night vision. In fact, that's why it's illegal almost everywhere to use them in clear conditions.
Ahhhhhh What?! Lol I have never heard of this nonsense before. I run fogs every morning & every night in multiple vehicles for years... Maybe it's just a arizona /western states thing!?
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Unread 12-30-2012, 12:09 PM   #4
Robb286
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Quote:
Originally Posted by jerretxx
Hey guys, I bought my girlfriend fog lights for her 05 grand cherokee. I found a site showing how to install these lights, it is very simple.
http://www.jeepforum.com/forum/f140/...nstall-867728/

However, has anyone ran a jumper wire to the tail lights to activate these? Id love to do that rather than pay our local dealership $100.00 to do so.

If you could tell me how, or message me a step by step how to that would be great!

Thanks!
I used that same thread when installing my fogs. Its very useful and extremely simple. I didn't run a jumper tho. I had my dealership do it in 20mins and only paid 45 bucks. Fairly cheap compared to what everyone else paid.
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Unread 12-30-2012, 02:49 PM   #5
colinzj
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Quote:
Originally Posted by Robb286 View Post
Ahhhhhh What?! Lol I have never heard of this nonsense before. I run fogs every morning & every night in multiple vehicles for years... Maybe it's just a arizona /western states thing!?
Nope. It starts at USDOT and goes to every state. (Same deal in Europe, too, where they're much crankier about enforcement than cops anywhere in the US are about traffic laws.)

Turning on the fogs puts the pool of light way too close to the vehicle. As a human being, you put your focus where the brightest light is. That's why DOT and E-Code design requirements put the hot spots of the low and high beams as far out as they do (and one of the many reasons aftermarket HID "kits" are dangerous—they put too much light too close to the vehicle).

With fogs on, the brightest location—and the driver's focus—are about a foot off the bumper, which is great when that's all you can see (like traveling slowly in fog), but a major problem when you should be scanning far down the road while traveling at speed. In a city where you've got a ton of street lamps it's not as much of a problem, but fogs put you at a serious deficit traveling through darker areas.
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Unread 12-30-2012, 03:00 PM   #6
jerretxx
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What I mean by using tail lights is using that circuit to power my fog lamps. The park lights/headlights have to be on for my tail lights to come on. If I use the power off of that, I can then control the lights by my factory switch. It's the same thing you would do while doing fogs an hi-beams. Our local dealer is charging $95.00 that's why I was wondering if anyone had done this.

I don't want the fogs on all the time, only on dangerous conditions.
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Unread 12-30-2012, 03:44 PM   #7
LouC
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When I used to install Hella fogs on my old school cars, the way we did it was to use the low beam circuit to trigger the relay, the power to the relay came from a fused lead right off the battery pos clamp. So we had a toggle switch between the wire from the low beam circuit to the relay and the fogs could be only when the headlamps were on low beam which is consistent with most states vehicle codes. I used this on a number of cars ('80s Japanese vehicles) using the harness supplied by Hella but I'm not sure if that will work with the WK's electrical system. I'd want to do it the way the factory did, the electrical systems on these Jeeps are pretty sensitive.
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Unread 08-27-2015, 10:01 AM   #8
fetterjohn
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I'm bringing that back from the dead...

Is it possible to wire the fog lights in line with the headlights so they both come on at the same time? I really don't want to purchase or install the kit with the new left light switch. Besides, I would always have them on (I like the look), so a switch would be useless.

Wiring assistance or a diagram would be great from you all of you smart people out there in Jeep land.

Thank you.

John
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Unread 08-27-2015, 10:04 AM   #9
fetterjohn
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Join Date: Aug 2015
Location: Austin, TX
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I'm bringing that back from the dead...

Is it possible to wire the fog lights in line with the headlights so they both come on at the same time? I really don't want to purchase or install the kit with the new left light switch. Besides, I would always have them on (I like the look), so a switch would be useless. OR have them wired like daytime running lights...to always be on.

Wiring assistance or a diagram would be great from you all of you smart people out there in Jeep land.

Thank you.

John
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