Fog light wiring on a 1968 Mustang - Ford Mustang Forum
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post #1 of 22 (permalink) Old 04-11-2009 Thread Starter
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Fog light wiring on a 1968 Mustang

hi ,

hope someone can help me with my fog lights wiring problems. I googled a lot already, but it seems like there is just no good wiring diagram for fog lights on a 68 mustang on the internet....
i checked out veronicas advices and her webpage, but it seems like my cables and wires are totally different from what is up on the internet...

so my problem already starts in the front...
the gt grill I bought on ebay said it's for a 68, so I ordered the underhood harness and the underdash harness and also the fog light switch and the circuit breaker for a 68. so I should have everything i need to wire it up, but somehow i can't find the right connectors to the new wires.

the fog lights itself have two wires with male connectors each. the underhood harness has a two prong plug for each light with a female and a male connector.

so here's my first question, what do I do with the "leftover" male connectors of the harness and the lights? Do I have to plug anything in the headlight harness under the hood or do I just have the wrong connectors on the lights?

Anyone an idea? don't worry i have more questions, I just thought i start in the front

thanks for help and suggestions in advance!!! :shiny:
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post #2 of 22 (permalink) Old 04-11-2009 Thread Starter
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thought some pictures mights help.... you can see in the pictures that the plugs won't fit together so here starts my problem...
and sorry for calling the blue plug a two prong plug, it's not but I do not know what you call them...
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post #3 of 22 (permalink) Old 04-11-2009
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You have the wrong ends on the fog lights pigtail.



Well you're in luck I'm here to save the day.

I have just completed making a new harness for fog lights.

I don't have a schematic made yet so I will try to explain it to you.

1) The black wire from the switch goes to the under dash harness and plugs into ground at the fuse box
2) The blue/black stripe wire from the switch runs to the the CB..
3) The other side of the C.B.runs to the single female Harness wire coming out of the back of the head light switch (power supply)
4) The Grey wire from the switch runs through a grommet to a connector just outside under hood near the grommet.
The Grey wire then continues through to the first Fog Light pigtail and onward to the 2nd pigtail.

5) along the wiring harness the Black wire from each fog light pigtail meets and terminate to ground with a common connector.

Want me to try and draw it up ?
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post #4 of 22 (permalink) Old 04-11-2009 Thread Starter
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thanks so much, that should help, I will let u know if it worked
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post #5 of 22 (permalink) Old 04-11-2009
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I attached a pic of the pigtail you need.

That one shown is an extra and for sale IYI

If you don't want original but just a plug that will work, you can buy the Ford connectors separately.

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post #6 of 22 (permalink) Old 04-11-2009
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I always love a mystery.

First of all, Cruiser68, did you buy the grille, lamps and harness all from eBay? Whatever, they didn't sell you a matched set. Looking at various sources the 68 fog lamps should have a single blue(?) connector instead of the 2 separate wires on your lamps. Those are lamps for an earlier car. OK, I see MIL1ION has just posted what looks like a more correct lamp wiring. VCM sells the 68 fog lamp pigtail with blue connector for $10. However, the Scott Drake photos, as well as the one from MIL1ION just above, seem to indicate that the correct '68 lamp wiring won't mate with your blue harness connector. Did they sell you the wrong harness as well?

Second, I agree that the '68 fog wiring schematic is hard to come by. The '66 seems to hide also until I found it right here on the site. Look up at the top of Classic Tech, take the thread and link marked for Wiring and Vacuum and look under '66 for Exterior Lighting. Not the schematic though; the pictorial. In the upper left corner of the External Lighting pictorial there is a schematic of how the fog lights are wired.

Third, MIL1ION, I'm not sure you have that wiring exactly correct. I doubt there was any ground wired into the fog switch and also doubt there are any grounds in the fuse block you can connect to. Ground on these cars is carried through the steel of the chassis. That wire confused with a ground is almost surely described by a much younger Veronica in this thread from 5 years ago: 66 foglight wiring diagram, NEEDED! - Ford Mustang Forums (V: May I suggest a medal for longevity of technical excellence?)

All of the early fog light switch wiring pigtails look much the same and I doubt they are wired any differently. The 3 wires on the fog switch are 1) power to the switch, 2) power to the fog lamps (gray) and 3) power to the tail lights which should come on with the fog lights. Another hint is that the wire colors from the '66 schematic are still the ones being used on the '68.

The first pictures above don't show what happens to the black wire on the engine side of the blue connector. I think it is a ground lug that is grounded on the radiator support metal like is shown in the '66 schematic. You have to somehow modify your lamp wiring to match the connector, get lamps with wiring that matches the connector, or take the fog lamp ground wire directly to ground without benefit of the connector.

If the 68 is somehow vastly different, I apologize in advance. But I think you will find that the above links will tell all you need to know.
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post #7 of 22 (permalink) Old 04-11-2009
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Thanks Ivy,I was looking for that myself. I was working from a cut up harness and figuring the wiring on my own.

I just went and got the rest of my harness and I have to recant about the black and blue/black wires.

The blue/black wire to the C.B. attaches to a single connector with blue/black stripe around the fuse box.This wire is tapped
into the 10 gauge black/yellow wire (POWER)
The black wire on the switch attaches to the single connector coming from the head light switch harness. AUX lighting.
I suspect this is what runs the front marker lights ,Tail light while removing the head lamps from the circuit.

Sorry about the Important mistake I made.
I got confused because I also had a Seat belt reminder system attached to the bracket behind the fuse box.

The Fog lights get their ground through the black wire in the harness and eyelets.
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Last edited by MIL1ION; 04-11-2009 at 06:57 PM. Reason: added content
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post #8 of 22 (permalink) Old 04-11-2009
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Except for pure originality purposes, exactly where you pick up the 12V is not a big problem. I just didn't want anyone to try and hook up a real GROUND in there somewhere; that might cause some problems.

BTW, don't ask me where I found it, I don't remember. And since it had a really odd file name I didn't even know what it was -- until just now. I only know I found it somewhere on the WWW last Christmas Eve! But take a look at this one which says the 66 thru 68 fog lights were generally wired the same.

And while I am on a roll, how about a similar one for the 65's. I haven't had time to study how they are different. It came from the same source as the 66_68 one; wherever in the world (literally) that may have been. Seems it might have been in Norway?
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post #9 of 22 (permalink) Old 04-11-2009
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Either do I IVY, that;s why I went out to the garage to inspect the harnesses to make absolutely sure.

Ford did some weird things with black wire (normally a ground wire) in their harnesses.


Personally,nobody beats up on me like I do to myself when I post wrong info.

Re the topic: I knew there was some kind of bypass in the circuit that illuminates the marker lights when using the fog lights.

We have it all sorted out now though

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post #10 of 22 (permalink) Old 04-12-2009 Thread Starter
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hey guys, thanks so much for all the information, it works and looks great!!!

i just have 2 more questions
where is the best place to mount the fog light switch and circuit breaker? Is there any spot you prefer or was there a factory-style mounting point?

thanks and happy easter everyone!
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The harness i got came with a bracket that mounts behind the fuse box....the CB mounts to that

but you can mount it anywhere on the firewall or fender.IYL

the fog lamp switch bracket mounts on the under dash lip near the ignition switch.

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Dennis, do you know what the blue w/red stripe wire w/the red bullet connector is for in your picture? I can't seem to find what it is for in my wiring diagram manual.

Thanks,
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Quote:
Originally Posted by MIL1ION View Post
The harness i got came with a bracket that mounts behind the fuse box....the CB mounts to that

but you can mount it anywhere on the firewall or fender.IYL

the fog lamp switch bracket mounts on the under dash lip near the ignition switch.

So you're saying fog lamp switch on right side of steering column? The one's I've seen were to the left of the E-brake? Anyone else with thoughts on this?

1968 C-Code Coupe -- All stock except for a 20 yo repaint. Royal Maroon Maroon Interior / Bench <33K original miles
2008 GT/CS Convertible

Mods: FRPP Strut Tower Brace / FRPP X-Pipe / FRPP Short Throw Shifter (Hurst) / FRPP CAK & Tune / Steeda Ultra Lites / Tokico D-Specs / Steeda HD Strut Tower Brace / LCA's / G-Trac Brace / HD Adjustible Panhard Bar / Rear Sway Bar + End Links/Steeda Stainless Brake Lines / DBA Rotors / Hawk Pads / Webelectric sequentials/ one touch top /rear windows
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Blue/red stripe wire is always for instrumentation lighting.

IIRC,That connector you see is for the Console PRD2L light

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Quote:
Originally Posted by C25sailor View Post
So you're saying fog lamp switch on right side of steering column? The one's I've seen were to the left of the E-brake? Anyone else with thoughts on this?

Well I could be wrong.. I have a rear window defroster and the switch on the right with kind of a space for the Fog Lamps.

From the right side of the of the dash ,The wiring harness even appears to run 2 different directions.
One runs straight back to the fuse box to pick up power and the other across and above the steering column to the left to the headlight switch then straight to the firewall.

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