You get to it through the trunk. You have to remove a fiberboard partion, and then move the air fan and plenum out of the way. There is a Pelican tech article about how to swap your windshield wipers around. It has a good description of how to get this done (with pictures), because access to the wiper motors is in the same area.
Sorry for the dumb question, but did you check the fuse first?
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Bill Krause
'79 911SC Euro
MY PELICAN GALLERY