GT Fog Lights

tx65coupe

Active Member
Nov 29, 1999
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I am going to add the factory style GT fog lights to my 65. I will be getting a new kit from one of the Mustang shops. Does anyone know where the best deal can be found?

I would like to put halogen sealed beam bulbs in them. The only bulbs I see are just regular sealed beam. Does anyone know if there is a halogen sealed beam that will fit this application? Is it a bad idea to do this? If it is the regular sealed beams will be fine I guess. I just like how they look and figured any additional lighting they provide would be good.

I know they probably don't put out much light do they?
 
I looked for something that would be more functional, but couldn't find anything close. I have a GT, and wanted to keep the original look, so I ended up with the repro set from Mustangs Unlimited.

The Sylvania Silverstar halogen headlights I have put out way more light than the stockers, so the Fog lights are just for looks.
 
Yeah I figured that would be the case. I didn't think that the fog light bulb had a halogen counterpart.

Maybe they will keep someone from pulling out in front of me because they make the car more visible.

If you turn just the fog lights on by themselves do they put any added light on the road at all?

As far as headlight bulbs go I went with the XtraVision, because I didn't want the colored look. Actually the Xtravision although it isn't as white, puts out more light than the Silverstar because the bulb doesn't have a coating on it. You won't really be able to see the coating because the halogen bulb is inside the sealed beam.

The GE Nighthawk is supposed to be really good too.

I think I am going to do the headlight relay mod that way more voltage gets to the bulbs and the headlight switch doesn't have to carry the load of running the lights.

I started another thread about the headlight bulbs a few days ago.
 
To install these in my 65 I need the following parts right? Can someone tell me if I need anything else.

1. gt grille
2. gt bars
3. light bulbs
4. light bezels
5. switch
6. breaker
7 underdash wiring
8 underhood wiring
9 wiring pig tails
 
The original fog lamp bulbs, labelled FOG at the bottom center of the bulb, has a horizontal plane output to the light beam. You can see it real good when you drive in the fog. They are designed to cut through the fog, unlike the regular headlight bulbs, but I also believe they are designed to be aimed more toward the road out in front of the car than the headlights. If you use anything else, you are probably using tractor headlight bulbs if they don't say FOG in the casting of the glass.

There is a clear smooth glass aircraft landing light bulb that fits the fog light housings/holders but it has been so long ago since I have had any of these parts for my cars.

The grille should be the same, as with the corral in the center of the grille. BEWARE, there is a 1965 style foglight bar and a 1966 style foglight bar. Do your homework because some of these places will send you the 1966 style bars when you ask for the 1965 style bars. I know there is a special add-on grille bracket that supports the fog light bars in the 1966, 1967 AND the fog light cups in 1968 Mustangs and those are required to install them in the car. I am not sure if there is a special bracket to install in the 1965 grille that supports the extra weight that the fog lights add to the ends of the corral bars. That extra weight can break the bars at the light cups if they are not installed in the car's grille.

Also, the 1965 and 1966 Fog Light Switch Bezel (that says FOG), is different than the 1967 Fog Light Bezel. I believe the 1965 and 1966 FOG letters are fine print black letters and the 1967 is bold print black letters on the bezel.
 
Thanks for the info.

Here is a link to the kit that I am going to get. I am also going to buy the wiring harness and switch which are sold separately.

I knew the switches were different. I also knew that the bulbs were unique, but I thought that that chrome strip accross them was part of the bezel.

The grille is different between non GT and GT. The bars mount in different locations. Well at least from what I have read and seen they do.

http://www.parts123.com/parts123/yb...~S2JM01I5YS74192111316e~Z5Z5Z5~Z5Z5Z50000016e

http://www.parts123.com/parts123/yb...~S2JM01I5YS74192111316e~Z5Z5Z5~Z5Z5Z50000016e

http://www.parts123.com/parts123/yb...~S2JM04G8EB74192111389e~Z5Z5Z5~Z5Z5Z50000016e
 
Does anyone know how the wiring for the fog lights is supposed to be routed? I also dont know where the breaker is supposed to be mounted. I'm thinking that the kit won't come with instructions. If it does they probably won't be that specific.

Also, I do not want to drill a hole in the dash for the switch, so I thought about making a small metal L bracket with a hole in it and painting it black to put the switch in and then mount that under the dash near the area where it is supposed to be. There is already a small hole there facing down, so that would make mounting the switch easy.
 
Any options that Ford put on it's early cars were all done with "add-on" harnesses. Even the Rally-Pac had it's own add-on harness.

The fog light wiring will run with the factory under-dash harness. Look on the wiper motor bracket, in 1967 the circuit breaker for the fog lights was bolted to two small holes in the wiper bracket with short gold-colored 1/4" hex screws. Also, I believe ALL of the early Mustangs were wired to accept fog lamps. In the 1967s (edit) and 1968s (end edit) there was a light blue wire with a black stripe that was wrapped back on the wiring harness near the fuse block behind a couple of wraps of black friction tape. That is the fog lamp feed wire. It may be a female connector and if it is then there should be a male plug with a loop on the other end of it that would be plugged into the female harness connector and the loop would be installed onto one of the lugs of the circuit breaker.

That blue wire with the black stripe IS HOT (energized) ALL THE TIME.

Bring up a picture of the regular grille and the foglight grille and compare them closely. The brackets in the right and left side of the grille may be in a different location, I'm not sure. There were additional brackets that were added to a '66 to '68 stock grille (from Ford) that came in a car with fog lamps.
 
Thanks for the info about the wiring. I read or heard somewhere that the fog lights are supposed to be tapped into the tail lights so they work with parking or head lights and turn off when the headlights are off.

Here is a link to Virginia Mustang GT and non GT grilles. If you look close you'll notice that on the grille for fog lights the mounting points are farther apart.

I think its weird that it is different frome one place and not the other.

65 STANDARD GRILL

65 GRILL (USE WITH FOG LAMPS)

Sorry about my CJ Pony links the link for their standard grille didn't show up. I'll edit it and put it in.
 
Ok, I never knew the what the difference was between the fog light and non fog light grille in the 1965. The difference is the placement of the bracket that holds the pony corral bars. Now that I see that I need to go downstairs later this morning and see if that bracket is removable and if that section of the grille has the same height from one location to the other. The main corral is still the same, as far as I know. Remember, the cups that hold the lights are different from 1965 to 1966. The top edge of one is sloped downward toward the upper center edge of the light cup holder and the other one is sloped upward toward the upper center edge of the light cup holder.

Ford was pretty good about making changes fairly simple when adding fog lights. It is possible that the 1965 fog light option was such a pain in the butt to them that they made sure that all of the later years were easier to convert to fog lights.

When I was in Lenexa Kansas back in the 80s I went to a few wrecking yards out in the Kansas City area and there were a bunch of old regular Mustangs (not GTs)that were missing factory fog lights but the add-on fog light brackets were still in the grilles of the cars, along with the wiring.
 
Ok, I did go look at the 1964 & 1/2 Mustang I have here and the grille is only capable of having the standard corral and bars installed on it. I believe Ford learned by it's mistake by making the grilles different in 1965 and made up for it in the 1966 through 1968 models.

It is said that you learn something new every day, and it seems to hold true for me. Thanks for the lesson, tx65coupe.
 
Your welcome. I was just sharing what I found out.

Do you know where the wring for the fog lights is supposed to be routed during the install?

I did find out that apparnetly there is already a hole in the bottom of the dash for the fog light switch.
 
I'll have to look at the hole you are mentioning for the switch because, if I remember correctly, the GT fog light switch was installed in a hole that was drilled in the dash face on the 1965 and 1966. It has been a while (a long while) since I converted a car to fog lights (parts car to someone's driver). IF you want to install the switch on a bracket (like the 1967 Mustang had, an offset bracket mounted under-dash) I'm not sure if a wiring harness designed for the 1965 or 1966 Mustang will route correctly (if the harness isn't a "universal fit" harness).

OH, yes, I have seen two variations of the 1965 and 1966 Mustang harness. One has one male and two female feeds and the other has one female and two male feeds where the fog light harness plugs into the headlight circuit. The plug the fog lights connects to is in the main harness and the three-connector harness comes apart and the fog light switch goes in line with the factory connector, again if I remember correctly. It has been so-o-o long.

The 1967 and 1968 factory fog lamp harness has a black lead that connects to a single black female connector at the headlight switch. When energized it turns the rear parking lights on when only the fog light switch is on.

Driving in Florida is illegal with only fog lights on, or it was back in the 80s when my ex-wife got stopped by F.H.P. for it.

I heard that fog lights have to come on with the high beams in New Jersey, but that is what happened to my dad in 1970. His 1965 GT350H (that was stolen in Jersey City) had to be modified when it came into New Jersey from New Hampshire back then.
 
I have read in a couple places that the hole for the fog light switch is already in the bottom of the dash. I looked on mine and there is a hole facing down. Is the switch supposed to be facing down?

I have seen that most cars now have the fog lights only on with the low beams. I guess because your not supposed to drive with high beams on in fog.

I didn't like how they went off with the high beams on our 97 Cobra, so I wired them so they work with parking, low, and high.

I figured that if no one is in front of me who cares how bright it is. Besides since the low beams go out the beam down low and to the sides isn't good so the fogs compensate for that.
 
tx65coupe:
I have read in a couple places that the hole for the fog light switch is already in the bottom of the dash. I looked on mine and there is a hole facing down. Is the switch supposed to be facing down?

Here is a pic of the switch location:

DSC05107.webp
 

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Thanks for the picture Tim65GT. That shows it best.

tx65coupe the fog lights in a 1967 and 1968 Mustang work independant of the headlights. I am not sure if the fog lights in the 1965s and 1966s do or don't work without the headlights. I know that the instrument lights and the rear parking lights also come on when the fog light switch in the 1967 and 1968 Mustang is turned on without the headlights coming on. In those cars the feed wire for the fog lights is a light blue wire with a black stripe and is always hot (I believe it was hot with the key off too but it has been a long time).
 
Tim65GT,
Thanks for the pic of the fog light switch.

l1k2gadd
I thought that they were wired something like what you just said. The kit I bought shows a wire that color in the picture. I'll have to wait until it arrives before I know what it comes with. I want the fog lights to operate independently of the other lights. So, I guess I'll run the blue/black wire to a 12V source.