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My bet is a bad ground. Why, because you have multiple, simultaneous failures that have very little in common except maybe a ground.
If you hunt down the widely distributed & available 986 fworkshop manual PDF, there are pretty good wiring diagrams. One page is devoted to ground points, about 10 total. Find the one(s) possibly related to all your problems, take of the nuts and with a wire brush or what ever get all mating surface shinney.
Put it (them) back together and put some grease (yup) or wd40 on the assembly ( or go to radio shack for there overpriced version of the same). Give a good jiggle and cinch them tight. Might be the fix.
Regards, PK
P.S. Your wife is a trooper.
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