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The grounds should be shown in the manual, I believe they are a couple pages before the wiring diagrams. Brief list:
Engine to frame, pass side
Core support upper, both sides (may be cover by harness & headlight motor)
Steering column support, underdash
Fuse panel, behind/above
Rear body, pass side behind interior trim (big 1/4 panel trim)
I may have missed 1 or 2; remember, 928 grounds are brown.
On the window switches, alot of guys have had luck with popping them apart to clean them up, they get some corrosion and dried out lube in there.
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