3rd brake light on 2003 connected to wing?

[PorschePRH]

I put a fixed wing on my 2003 C2 Coupe, and I re-used the existing harness with a splice of the wires for the wing fault light. I also cut the 2 wires to the 3rd brake light on the moveable wing and taped it off.

The 3rd brake light on the body of the car is not working. I don't know if it was working before or after the wing change, so I am wondering if I did something that caused it to stop working. If I did it, I will try to fix it myself, otherwise I'll take it to the dealer to have them sort it out under warranty.

Does anyone know if the wiring harness for the wing has anything to do with the 3rd brake light on the car?

TIA

Edited July 28, 2005 by PorschePRH

[Loren]

Yup...

2003 (factory) Spoiler wiring

[PorschePRH]

Hmmmm.......

Ok, well, it's better and worse now...

From the diagram, it was clear that one of the microswitches had to be closed to allow the 3rd brake light to light up.

Problem solved. I depressed the microswitch, and now the third brake light works.

And I cut and jumpered the green/yellow and gray/brown wires together for the wing light.

But now I have a wing fault as soon as I start the car, i.e. I don't have to drive over 74mph to get the light....

Ugh. I should have just bought the new harness, but now I am sure I am pretty close.

Any ideas?

I know people are bypassing the light by modifying the existing harness, so it must be possible to have the 3rd brake light working and not have the wing fault...

[Loren]

Hmmmm.......

Ok, well, it's better and worse now...

From the diagram, it was clear that one of the microswitches had to be closed to allow the 3rd brake light to light up.

Problem solved.  I depressed the microswitch, and now the third brake light works.

And I cut and jumpered the green/yellow and gray/brown wires together for the wing light.

But now I have a wing fault as soon as I start the car, i.e. I don't have to drive over 74mph to get the light....

Ugh.  I should have just bought the new harness, but now I am sure I am pretty close. 

Any ideas?

I know people are bypassing the light by modifying the existing harness, so it must be possible to have the 3rd brake light working and not have the wing fault...

Sandy and I went through the aerokit harness this last weekend. Here are his comments:

Pins 2, 5, & 6 should then show continuity to each other and also to ground, since pin 5 is the small BROWN ground wire. This means that the instrument cluster receives a permanent "spoiler-extended" position signal from pin 2. The CHMSL on the rear deck, beneath the rear window, receives an enabling ground from pin 6. Pins 9-12 provide wiring interfaces with the engine compartment light and cooling fan, which are retained when the hinged, rear deck, engine compt. lid and electric spoiler assembly are replaced with the fixed spoiler and lid assembly.

[PorschePRH]

Well, that was it!

I connected 2, 5, and 6 together and re-connected the Green/Yellow and it works.

I left the microswitch depressed for the 3rd brake light, but probably didn't need to...

So, in summary, buy the replacement wiring harness. It's a major effort to remove the old one (everything has to come apart, including parts of the wing motor to release the microswitches, and it involves cutting and soldering wires... I will have a big effort to get the old deck lid back together if I ever need to...

Thanks for the help, Loren!