Any idea what this wire/connector is for?

[Idaho Chris]

Comes out of wiring harness that runs to engine bay just above the floor dimmer switch?

 

[Don C]

Light green wire with red dots is for the parking brake warning light, should connect to the switch on the parking brake.

 

[midlife]

And the parking brake light was an option, so often times that plug won't be used.

 

[Idaho Chris]

Since I cannot find anywhere to plug in this pigtail on the parking brake I apparently don't have that option.  Thanks for your replies!

 

[Don C]

If you don't have a round red light that says "BRAKE" on the lower dash to the left of the headlight switch that will confirm you never had one.

 

[Idaho Chris]

Don-

Sounds like the same BRAKE light that is on my '68 F250 High Boy.  And nope, the Mustang doesn't have the light.  Thanks for the info.

 

[Trevynd]

And the parking brake light was an option, so often times that plug won't be used.

What light would it illuminate? 
I was thinking about getting the switch so I could plug it in, but I don’t have any indicators that I can see on my dash 

 

[timachone]

It is a separate red warning light on the lower, left part of the dash, rare to find and not reproduced... 

 

[Hemikiller]

Parking brake warning light was part of the Convenience Group option, which requires a whole harness to install. You could get the repop of the later years truck brake lamp and wire it up yourself. 

https://www.macsautoparts.com/brake-light-warning-bezel-mounts-on-the-dash-ford-mercury-60-46278-1.html#tab-label-details_tab-title

View attachment 53627

 

[MikeGriese]

You would also need the switch on the parking brake bracket.  It mounts in the two holes you see in the first photo.

 

[James Devonshire]

Would anybody have a picture of the switch mounted in place?

Thanks,

JD.

 

[JimB73]

On a related question, would that wire control the Brake light indicator on a 73 that has the light in the cluster? or is that controlled by a different wire?

 

[midlife]

On a related question, would that wire control the Brake light indicator on a 73 that has the light in the cluster? or is that controlled by a different wire?

That is the parking brake on indicator lamp; the dash cluster lamp is the proportioning valve stuck out of alignment, indicating poor braking and a problem in the system.

 

[MikeGriese]

Would anybody have a picture of the switch mounted in place?

Thanks,

JD.

Couldn't find a photo from a Mustang, but this picture from a '73 Torino will give you a good idea of where the switch is located.

 

[JimB73]

That is the parking brake on indicator lamp; the dash cluster lamp is the proportioning valve stuck out of alignment, indicating poor braking and a problem in the system.

Ah, Okay, Thanks for clarifying! Did 73 have the parking Brake on indicator option or was that 71/72 specific?

 

[secluff]

Hello JimB73,

The park brake warning lamp was not available separately but was part of the Convenience Group option, available for all 71-73 Mustangs. It included trunk, glove compartment, map, underhood lamps, headlamps on warning buzzer, automatic seat back release, under instrument panel courtesy lamps (standard on verts), park brake warning lamp, and locking glovebox latch. This option was a lot of content in '73 for $45.53. 

The switch has changed part number several times over the years with F2UZ-15A851-A as the final version and is still available from Ford. I usually suggest Don @ Ohio Mustang Supply, but his site shows out of stock. You could also check with your favorite parts house by application or crossing the Ford part # to theirs. 

The illustration shows the switch location held in place by a #10-24 x 1" screw. The second hole is for the locator/anti-rotation stud.

 

[JimB73]

Hello JimB73,

The park brake warning lamp was not available separately but was part of the Convenience Group option, available for all 71-73 Mustangs. It included trunk, glove compartment, map, underhood lamps, headlamps on warning buzzer, automatic seat back release, under instrument panel courtesy lamps (standard on verts), park brake warning lamp, and locking glovebox latch. This option was a lot of content in '73 for $45.53. 

Great info, Thanks!!

 

[James Devonshire]

Thanks very much for the picture. If I get the switch, is the rest of the wiring in place to where I'd only need to source and install a warning light? I'd like to see a light to remind me the parking brake is on?

JD.

 

[MikeGriese]

The rest of the wiring is not in place.  This circuit is part of the Convenience Group, which adds a bunch of bells and whistles (well, buzzers and lights), like the map light, under dash lights, automatic seat back releases, parking brake warning,  glove box lock, trunk light (not part of the convenience group harness), and engine compartment light.  I'm sure I've probably missed something.  You can roll your own by following the wiring diagram if you just want the parking brake light.