Headlights Turn Off...HELP!!! - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 05-10-2012, 12:12 AM Thread Starter
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Headlights Turn Off...HELP!!!

I have a 92 Mustang GT 5.0 and I have a major problem with my headlights shutting off, which is scary as hell when it's dark outside and you can't see where you're going. It is random when they go off and usually when I turn them on high beam they will come back on, most of the time, but not all the time. So I purchased and installed a brand new turn signal/wiper switch (multifunction switch) and still the same thing. Didn't fix the problem.

However, when I removed the multifunction switch and looked at the wiring I noticed one of the plugs that plugs into the multifunction switch was melted (see picture--long, slender plug). I looked online at several Mustang parts suppliers (Latemodel Restoration, Mustang's Unlimited, Auto Krafters, Mustang's Plus) for wiring and plug replacements. I found a replacement kit from Latemodel Restoration that included a multifunction switch, a headlight switch plug and one of the multifunction switch plugs, but it's not the plug that's melted. I can't find that plug anywhere. Does anyone know what my headlight problem is (assuming it's not the melted plug) and where I can find a replacement plug for the one that's melted? Any advice would be appreciated. Thanks...

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File Type: jpg 92 Mustang GT Turn Signal Switch (Multifunction Switch) Wiring.jpg (63.6 KB, 16 views)
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post #2 of 11 Old 05-10-2012, 02:38 PM
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Many cars have a circuit breaker in the head light switch. This may explain why the lights come and go. Have you inspected the head light switch for evidence of overheating?

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post #3 of 11 Old 05-11-2012, 01:09 AM Thread Starter
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No, I haven't inspected the headlight switch yet, however I will. I just got my replacement parts in from Latemodel Restoration tonight and in the kit was a headlight switch. Sometime this weekend or next week I'll tackle this project.

Oh, another problem I forgot to mention when I described my problem was my windshield wipers quit working also and are stuck in the middle of my windshield. That's why I originally thought it was the multifunction switch malfunctioning. Anyone know what is causing the wipers to not work? It's not tied into the wiring on the headlight switch somehow is it?
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post #4 of 11 Old 05-11-2012, 04:48 PM
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Do you run the foglights? Doing so will overload the circuit and melt the plug like you have shown as well as the headlight switch plug. Very common on foxes. Best to run the fogs off a relay!

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post #5 of 11 Old 05-11-2012, 05:08 PM
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^^^ it is the fog lights overheating the switch. Happened to me also.
https://www.corral.net/tech/maintenance/foglights.html


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post #6 of 11 Old 05-12-2012, 09:37 AM
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Your MFS, turn signal switch is melted inside, you cannot repair it.

you will have hi beams, but not low.

you need to replace the switch, and put the fogs on a relay, or it will happen again.

that burnt connector can be replaced but is not the probelm, only the result.

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post #7 of 11 Old 05-13-2012, 09:26 AM
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You guys are right, back in the day there was a TSB for that. The pigtails like to melt down. I just rewired my whole car and have to get new ones also. Lotta load on those
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post #8 of 11 Old 05-13-2012, 10:27 PM
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connectors is not a big deal its the MFS, that is melted inside..$$$$

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post #9 of 11 Old 06-02-2012, 11:40 PM
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where is this mfs?

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post #10 of 11 Old 06-03-2012, 12:27 AM
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turn signal, hi beams, flash to pass, wipers, washer fluid...........that switch that has mutli functions.


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post #11 of 11 Old 06-03-2012, 09:18 AM
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my bad MFS = multi function switch

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