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Originally Posted by stateofidleness
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Going through the EXACT same thing currently and trying to eliminate switches little by little. I replaced the one under the handbrake already and that fixed my "PARK" light on the gauge issue. But no dice on the top going up or down consistently.
I have a 2000 so I'm guessing I have the "B Version" transmissions as well. I unhooked the transmission cables from the motor on both sides and when I hold the switch down, the motor continuously spins like it should (no dead spots or hesitation). This is a good thing right?
My next step will be the microswitch above the rearview mirror. My top light doesn't go on at all, even in fully-closed position. That's gotta mean something right? 
EDIT: I'm going to try to stop by the dealership tomorrow to get the microswitch above the mirror, but I'm a little confused still on what "Version" I have. Being a 2000 makes it even more difficult. I don't have the little "lever switch" thing on the top of the motor under the clamshell. I DO have the dual-row looking switch above the mirror though. Every reference I see to this switch though says 97-99!
97-99 - 986.613.795.02 ( 911 / 356 Porsche Parts | Porsche, Wurth and Fuchs Wheels | Sierra Madre Collection) looks like my switch, but will that work on my year model? |
No dead spots or hesitation is definitely a good thing.
Not having the black lever microswitch on top of the electric motor means it's the B-version transmissions and set-up. To confirm it further, take a look at the double relay in the relay tray above the fuse tray in the driver's side kick panel. If you have a black square on the top surface of that relay, it's definitely the B-Version system. A black triangle is for the A Version.
The parallel strips microswitch in the convertible top latch receptacle assembly can cause intermittent operation because it develops cracks which are hard to see with the naked eye. The cracks are minute enough that heat (such as the sun beating down on that area) can cause it to make contact and break contact again when it cools down. If you are not sure which version of this microswitch you have, remove it and bring it to the dealer to compare with the new part.
If the "convertible top open" light does not go on or off at the appropriate times in the cycle, you have to look into one of the two microswitches INSIDE the driver's side transmission.
Regards, Maurice.