J-McDonald

I had the motorized spoiler on my '91 C2 cab replaced with an MA Shaw RS America spoiler. At the time the fixed wing was put on, I had the "ET Head" third brake light removed for aesthetic reasons. To avoid having the wing warning light come on, I had my mechanic bridge the two pins on the disconnected decklid wiring harness plug, as per Tom Sharpes' instructions (see: <a href="http://www.pelicanparts.com/techarticles/964_rear_wing/964_rear_wing.htm" target="_blank">http://www.pelicanparts.com/techarticles/964_rear_wing/964_rear_wing.htm</a> ).

This worked great until the car came up for inspection and I had a body shop put the third brake light back on the car (so it would pass inspection). The wiring for the third brake light is apparently integral with the decklid wiring harness, which also includes the wiring for the wing mechanism. As a result, the body shop had to plug the wiring harness plug, leaving no room for the bridge wire. Since the pins were no longer bridged, the warning light started coming on again.

I then took the car to my mechanic so he could figure out how to bridge the pins, while keeping the decklid wiring harness plugged in (allowing my third brake light to work). All this time, I never considered disconnecting the wing motor sending unit under the dash (see the tech article), because the tech article clearly states that only 1992 and up cars have this unit.

Alas, I just got a call from my mechanic, who informed me that my 1991 C2 does, in fact, have the under-dash detachable unit, which he disconnected, resulting in no warning light. I know that my car was a relatively late production 1991 (it came to the US in late December 1991 and the first owner took delivery in January 1992), so maybe Porsche made the transition sometime in 1991, rather than 1992, as is stated in the article.

All of this is my long-winded way of saying that, if you're planning on putting a fixed wing on your 964, you should check under the dash to see if you have the under-dash detachable unit (there is a picture of it in the tech article), and save yourself from having to make the wire bridge for the pins.

shaker71

J,

How much work did it take to get the MASHAW spoiler ready for paint?

Bill

BrokeAss

I just took a look at your profile - I love the look of the RSA tail!
Getting rid of "ET" would be a bonus too!

Adrian

For 1989 and 1990 model year 964s the control unit is under the right seat and requires jumpering because it uses a different control and warning system. It is not difficult to tap in at the rear of the connector and make the jumper work there. Can be a little messy but a good auto electrician should be able to pop pins 3 and 7 and hook them up.
In model year 1991 (May 1990 to July 1991) a new control unit was introduced and was placed where the central locking control unit of the earlier models was located under the dash. The control and warn systems speed input were combined. Some components were added and others removed. There are significant differences between a 1990 and 1991 model year 964. The alarm system was also changed and this can be found under the right seat as well on a 1991 model.
I was not aware that the MY 1991 type control units could just be disconnected but it is nice to know.
Ciao,
Adrian
911C4

J-McDonald

Bill - the bodyshop charged me around $400 to remove the motorized wing and prep, paint and mount the RSA wing. The prep work consisted of filling pin holes in the fiberglass, sanding seams and, most of all, cleaning up the louvers on the top (which he described as pretty messy - lots of excess fiberglass flashing).

That price didn't include installing the third brake light. I had them install a 3.2 Carrera cabrio third brake light (which has a base designed to work with the wing - you could probably also have your bodyshop modify the base of your 964 third brake light to work with the wing).

adamsbr

I also have the same MA Shaw RS Wing on my C2. It's a 1990 that was built in Oct. 1989 but curiously or I guess fortunate for me, it has the plug under the dash on the passenger side. I will pull the plug on that pesky warning light.

91C2wrencher

J, I appeciate all the work that went into your wing project, it looks great! But I've got a couple of questions. 1. The car pictured is a targa not cab. 2. The car pictured is not what I recall the 964 targa to look like, in fact it looks like a earlier car targa bar, are you sure your driving a 1991? I believe that the only targa made for the 964 was the glass top version. Not flaming here just observing...

J-McDonald

The car in the pelican parts article belongs to Tom Sharpes, not me. His car is a 1990 C2 targa. (You're incorrect concerning targas - 964 and previous targas have the "traditional" targa bar with removeable fabric-covered panel between the targa bar and the windshield header - the first "big sunroof" targa was the 993 targa, introduced in 1996).

Pictures of my car - a 1991 C2 cab - are at the link in my signature line below.

91C2wrencher

Ok, thanks for straightening me out on that. Nice to see other, possibly house bound workers, lurking here instead of working!

LouZ

Hey 91C2wrencher, I'm working in the office!(in Malvern, how's Phoenixville?). Instead of taking those "cigarette breaks", I sneak in a "brouse"!

LouZ

I should read my reply before submitting...that should read "BROWSE"

Trader220

brous browse browze hmmm?

Penn Valley

91C2wrencher

Lou, well it pretty nice today, hmm, just got back from a "spirited drive" in 964, all clean and shiney after being out in the rain to Hershey on saturday....life's gooood.........man I feel like a having smoke......