Help with third brake light (spoiler)

[jam996]

Hi guys,

I changed my spoiler from a fixed spoiler w/o brake light to one with a brake light, Didn't want to pay over a 100$ for a new harness again.. I have the connector for the brake light, my question is where is the best place to connect it so It lights up when I brake, tail light, the other 3rd brake light on car, or on the harness?

Any suggestion?

thanks

[jam996]

How to get to the third brake light wires on the body?

[Loren]

It would be helpful if you told us the exact model of your car and year.

And... which spoiler to which spoiler (Porsche? aftermarket?)

[jam996]

Yes ofcourse, MY05 997 C2 coupe, from misha wing no light, to vorsteiner vrt wing with spoiler light.

Thanks

[Loren]

For MY2005 C2 coupe...

There should be two wires for the third stop light - brown/violet and brown/white.

The brown/violet wire should come from pin 8 of the white 30 pin connector (TSX2_2)and the brown/white wire from pin 26 of the same connector.

The connector is near the bottom of the B-pillar near the chassis but the wires should already be in the engine compartment (since it would have been wired that way from the factory).

[jayi836]

I have an issue with the 3rd brake light working intermittently,on a 99 C2 cab.

The pop up spoiler light works all the time when raised. However the light on the Clam shell doesn't wont work consistently, and seems to affect the cruise control as well. Is there a micro switch on the pop up spoiler that is bad and affecting the light on the clam shell?

If I open the Clam shell an inch by activating the top the light comes on,close it it goes out.

I have searched around but no results.:confused:

[Loren]

I have an issue with the 3rd brake light working intermittently,on a 99 C2 cab.

The pop up spoiler light works all the time when raised. However the light on the Clam shell doesn't wont work consistently, and seems to affect the cruise control as well. Is there a micro switch on the pop up spoiler that is bad and affecting the light on the clam shell?

If I open the Clam shell an inch by activating the top the light comes on,close it it goes out.

I have searched around but no results.:confused:

You need to check the wiring harness and connectors for corrosion - or loose pins/crimps.

[jayi836]

Loren,

Thanks for the information, any tips on where to start looking? I have checked at the light itself and the the connector to the Clamshell assembly under the sound or heat insulation. the issue seems too predictable to be corrosion unless there is a contact block with exposed contacts.(like a slider contact on a minivan side door).

It seems to be related to the clamshell, as I mentioned raise the clam shell an inch light works.

Jay

Edited March 21, 2014 by jayi836

[Loren]

You are going to need to follow the wiring back and see if it is or has been pinched.

[jayi836]

Hi Loren,

Thanks for the tip, I just had the clam shell off when I replaced the Cabriolet cable assembly. The connections are solid on both ends. The problem is very predictable the last inch of travel when closing the light goes out.

The pop up spoiler light works all the time,do you a schematic on the circuit? there must be some interlock between the two lights.

Jay

[Loren]

MY99 high mounted lights...

(click to enlarge)