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I had my passenger side switch out last week to fix a non-functioning window. It turned out that one of the rivets that hold the connecting spade to the switch was loose.
I thought I'd pass on a couple of tricks to give a bit more reliability to the switch. First, while you have the switch out you can solder the spades to the rivets. This will greatly strengthen that connection. Second, resist the temptation to rotate the switch to get the window to operate in the direction of the toggle. As was already pointed out just swap the position of the two middle wires (to the motor) on the switch. To ensure good load capabilities Porsche used very heavy gauge wire. The down side is that the wire is stiff and twisting it will place a lot of strain on on the fragile switch connections and because of the age of the cars will lead to cracking of the insulation. Keep the switch as straight as possible.
As an aside remember that you can test the motor functions by simply connecting a 12 volt source to the window motor leads.
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