1987 Mustang GT Headlight switch. - Muscular Mustangs
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post #1 of 7 Old 06-09-2007, 11:54 PM Thread Starter
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1987 Mustang GT Headlight switch.

I have a 1987 Mustang GT with fog lights on it. I have quit using them, because the wiring to the fog lamps gets so hot, that it starts melting the back of the switch. I have seen on ebay that they have a switch that is suppose to be an upgrade to the original, and has a flashing light in it that tells when the wiring gets hot. I have also found a site that says the wiring to the fog lights is too small, and really creates alot of resistance, and this is where the heat is coming from. Ford says they have never heard of such a switch, and their service bulletin 89-11-19 addresses the problem, but says the wiring harnes to the lights, the switch and connector must be replaced. Has anyone else run into this problem, and is there such an upgraded switch out there? Ford says no, but this switch has the same number as the original number, which Ford says they still sell for 135 bucks. Just wondering if anyone might have a different approach to the fog lamp senario, or is this RARE switch just a bogus thing?.

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post #2 of 7 Old 06-10-2007, 07:53 AM
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Mine didn't work when I got the car, and I just rewired the lights to a toggle.

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post #3 of 7 Old 06-10-2007, 08:36 AM
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My light switch was melted when I got my car. I had to rewire a new connector so I could use my headlights and fogs. I've seen that upgraded connector and wiring on ebay. I don't know if it really works or not though. Unless they used a larger wire with less resistance I would assume it is going to do the same as the original.

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post #4 of 7 Old 06-10-2007, 02:00 PM
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I don't know of any switch with a light that comes on when its hot. I assume that is something custom.

The melting of the switch is a common problem, and I believe Ford is right that is has to do with replacing the wires with a larger gauge. You may be able to get a switch on ebay or from somebody chopping their car for parts, but since Ford is still selling them I'd jump on it. Also see if Ford can still get the upgraded wiring harness, if not then you'll need to replace the wires individually.

If you don't want to go through all of that then you can simply just rewire the lights using a heavier gauge wire and a switch from an auto parts store. If you don't like the idea of having an aftermarket switch sticking out of your dash you can always hide it under the dash, under the seat, in one of the glove boxes, or even in the ash tray.

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post #5 of 7 Old 04-23-2008, 01:33 PM
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Sometimes something old might work in todays cars.

Just a thought, but you might try one of the old Ford hi-beam foot switches for the fog lights. This way there is no unsightly aftermarket switch on your dash and you can activate it without removing your hands or fumbling under the dash while driving.

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post #6 of 7 Old 03-30-2014, 02:44 AM
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