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Old 02-10-2012, 10:44 AM   #1
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91 gt fog lights problem!

I have a 91 gt and every time I cut the fog lights on and run them for about 10 mins I lose all my lights! A friend of mine said ford had an issue with this back in the day. I've been tthinkin about just puttin them on a toggle switch, unless somebody has a fix or a better idea for me! Thanks!!!!!
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Old 02-10-2012, 11:27 AM   #2
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It could be the switch.they have been know to go bad.or also sounds like u may have a bad connection somewhere cause the wires to get hot.I would chase the wires first and look at the switch and or change it.if it is the switch putting them on a toggle may tell u that.but personally that may require hacking ur wires.
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Old 02-10-2012, 11:39 AM   #3
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It was a recall way back. There is a fix but alot of wiring. Just google foxbody fog light fix. there is a whole page on step by step with pictures.
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Old 02-10-2012, 03:10 PM   #4
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Re: 91 gt fog lights problem!

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Originally Posted by 91BlueMule View Post
I have a 91 gt and every time I cut the fog lights on and run them for about 10 mins I lose all my lights! A friend of mine said ford had an issue with this back in the day. I've been tthinkin about just puttin them on a toggle switch, unless somebody has a fix or a better idea for me! Thanks!!!!!
The factory wiring harness uses wires that are too small to carry the load for the headlights and fog lights together. This negatively affects several components in the system.


Here is the fix: GT Fog Light Fix
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Old 02-10-2012, 03:16 PM   #5
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bookmarked.
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Old 02-10-2012, 03:33 PM   #6
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Re: 91 gt fog lights problem!

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bookmarked.
It is in the "Useful Info" thread too.
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Old 02-10-2012, 03:59 PM   #7
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Quote:
Originally Posted by Trojan Horse

The factory wiring harness uses wires that are too small to carry the load for the headlights and fog lights together. This negatively affects several components in the system.

Here is the fix: GT Fog Light Fix
This^^^, they do make switches that can handle the load now but they can be pricey.
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Old 02-10-2012, 04:02 PM   #8
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Re: 91 gt fog lights problem!

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This^^^, they do make switches that can handle the load now but they can be pricey.
What about the wires?


The article says they are 2 sizes to small.
Now I don't know that for sure, as I don't know the amp draw or the wire size, but the author of the article is well known there for his Mustang knowledge.


If you install a heavier switch, then you might end up with a harness fire?
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Old 02-11-2012, 12:36 AM   #9
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Just do a new relay setup for your fogs and headlights. You'll be surprised at how much better your lighting will be just by doing this. The relay kits are reasonable and are typical of what people do when they do HIDs.
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Old 02-11-2012, 08:24 AM   #10
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Quote:
Originally Posted by Trojan Horse

What about the wires?

The article says they are 2 sizes to small.
Now I don't know that for sure, as I don't know the amp draw or the wire size, but the author of the article is well known there for his Mustang knowledge.

If you install a heavier switch, then you might end up with a harness fire?
I basically did what the article stated to mine. I like being able to run them whenever I want. I'm also still using the original switch that came in the car and have had no problems with the lights since I rerouted my fogs. The rating on the stock switches was low to begin with and works fine for just head lights.

Looking at them the wires aren't any smaller than any other vehicle and the main power wire is rather large ( can't remember the gauge).
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Old 02-11-2012, 02:34 PM   #11
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Re: 91 gt fog lights problem!

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Originally Posted by 93slowstang View Post
I basically did what the article stated to mine. I like being able to run them whenever I want. I'm also still using the original switch that came in the car and have had no problems with the lights since I rerouted my fogs. The rating on the stock switches was low to begin with and works fine for just head lights.

Looking at them the wires aren't any smaller than any other vehicle and the main power wire is rather large ( can't remember the gauge).
Ok, You were talking about a heavier switch, which is why I asked about the wires.
If someone were to just plug in a heavier switch it could lead to the wires getting hot and shorting out, possibly causing a harness fire.


If you separated the fogs from the headlight circuit, then the wires in the harness should handle the amp load.
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Old 02-11-2012, 06:32 PM   #12
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Quote:
Originally Posted by Trojan Horse

Ok, You were talking about a heavier switch, which is why I asked about the wires.
If someone were to just plug in a heavier switch it could lead to the wires getting hot and shorting out, possibly causing a harness fire.

If you separated the fogs from the headlight circuit, then the wires in the harness should handle the amp load.
Pretty much, never could understand why the fogs didn't have an independent power wire.
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Old 02-11-2012, 07:22 PM   #13
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Re: 91 gt fog lights problem!

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Pretty much, never could understand why the fogs didn't have an independent power wire.
It was one of those stupid mistakes that the people involved knew better, but it slipped through anyways.


Engineering error.
Don't even get me started on those.
I have had to deal with more instances of those errors at my previous job than anyone should ever have to.
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