Fox Can anyone help me identify this plug?

cbac89 · Sep 18, 2024

This is on the alternator/headlights harness. Ive tracked all the other wires, but cant figure this one out. Its got 2 wires, black and brown/yellow.

General karthief · Sep 18, 2024

Fog light plug?
This on an LX?

Mcmahst · Sep 18, 2024

I wonder if that’s really a Red with Yellow tracer wire.

cbac89 · Sep 19, 2024

General karthief said:
Fog light plug?
This on an LX?

This is an LX so no fog lights.

Mcmahst said:
I wonder if that’s really a Red with Yellow tracer wire.

in the picture it does look red but i tried to clean it up and it looks brown up close.

Mcmahst · Sep 19, 2024

Normally, Ford sticks with wiring coding over the years. It would help to have a Ford Wiring manual for this car. Those books are really worth it when you have a problem or a question. I would look for that color combo online to see what Ford used it for on other cars. Light blue with red tracer was used for almost 20 for the same function, so it’s possible other uses will point you in the right direction. Good luck.

91AOD5.0LX · Sep 19, 2024

On my 1991 LX the headlight harness has a plug on each side of the car for fog lights. I assume it was the same harness used for the GT.
The wires (2) are also black, brown/yellow.
The plug looks different from yours but perhaps your LX is a different year ?
Here are photos…

cbac89 · Sep 19, 2024

91AOD5.0LX said:
On my 1991 LX the headlight harness has a plug on each side of the car for fog lights. I assume it was the same harness used for the GT.
The wires (2) are also black, brown/yellow.
The plug looks different from yours but perhaps your LX is a different year ?
Here are photos…

Mine is an 89 so that could be what it is. Which end of your harness is it on? Mine is on the firewall end.

91AOD5.0LX · Sep 19, 2024

cbac89 said:
Mine is an 89 so that could be what it is. Which end of your harness is it on? Mine is on the firewall end.

Ok not it then. Not on my firewall end. Mine are hanging under the front bumper. Two plugs in total. One on the driver and one on the passenger side.

General karthief · Sep 20, 2024

Ok, I have a 89 GT and looking at the fog light plug, that's not it.
Seems I remember a plug like that but after working on so many I don't know where.
Exact location?

91AOD5.0LX · Sep 20, 2024

Maybe it’s an HVAC plug????
I noticed this pigtail on eBay. It’s Ford specific and resembles your plug by design, wiring, and internal contacts.
Just a thought….

Mcmahst · Sep 20, 2024

Ok, this may be it or at least it’s a step closer in identifying the wire itself. I don’t have the EVTM for an 89, but I do have the 88 Mustang book. On page 112, under the 2.3 engine, I see the only BR/Y wire identified, as part of the cooling fan system. 89 may have been different. Having the 89 EVTM would help I’d the connector.

Bullitt347 · Sep 20, 2024

It looks like it has never been plugged in.
Chances are you are worrying about nothing.
It is not unheard of for the factory using the same harness across different trim levels.
I have see LX's with fog lamp harness ends when LX's did not get fog lamps, and so on.
If the car ran fine before you saw that harness end, then just tuck it up out of the way and continue on.

General karthief · Sep 21, 2024

I've been all over my engine compartment and see no plug matching that.
Where exactly is it located?

Praetorious · Sep 21, 2024

On Ebay,there is a guy selling a harness for a 89 mustang,a headlight harness and that plug is definitely there,im gonna ask him if he knows where it goes to, its got me curious,lol

I have not seen this plug on any 90 to 93 harnesses Ive checked out so i have a feeling that maaaybe it could be to one of those options 87 to 89s had that didn't come in the other cars? like that array of warning lights in the cluster?

89ripper · Sep 21, 2024

Fog lights...didnt ford change this because of some wiring issue? I used to have problems with mine and ended up not using them anymore

Praetorious · Sep 21, 2024

Could be but being that foglights suck a lot of juice they would have had 2 plugs, one for each foglight? i dont think they would have ran 2 foglights off one single plug but they have done weirder things,lol

Praetorious · Sep 21, 2024

In this picture you can see that plug.

89ripper · Sep 21, 2024

Praetorious said:
Could be but being that foglights suck a lot of juice they would have had 2 plugs, one for each foglight? i dont think they would have ran 2 foglights off one single plug but they have done weirder things,lol

True that. Ill go look at my 89 here in a little bit and ill report back with what i find

Praetorious · Sep 21, 2024

Cool, The problem with the foglights affected all years, once they are on for several minutes everything starts going haywire cause it overheats the wiring system including the headlight switch.

There is a really good write up on how to REALLY fix this, reason i typed that in all caps is because there are a lot of "Witch doctor" fixes for it but the real fix involves adding a relay and some other things for a permanent fix, i have this fix buried somewhere in my computer and the reason i haven't done it is because i need to replace my dash one of these days and once i do that ill run the new wires needed for the fix plus install the relay.

89ripper · Sep 21, 2024

I just needed to reassure myself. I think @Mcmahst and @91AOD5.0LX are on the right track. Was this originally a 4cy? Im thinkin so.

Fox Can anyone help me identify this plug?

cbac89

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General karthief

wonder how much it would cost to ship you a pair

Mcmahst

cbac89

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Mcmahst

91AOD5.0LX

I have a slight sag in my rear

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cbac89

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91AOD5.0LX

I have a slight sag in my rear

General karthief

wonder how much it would cost to ship you a pair

91AOD5.0LX

I have a slight sag in my rear

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Mcmahst

Bullitt347

I have been doing it wrong this whole time

General karthief

wonder how much it would cost to ship you a pair

Praetorious

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89ripper

Praetorious

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Fox Can anyone help me identify this plug?

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