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The resolver ground wire is just an optional thing if you have the resolver cable shielded. You send the shield to ground. It works fine though to just twist ex/!ex, and then twist sin/!sin, and twist cos/!cos.
Also, what I did was in the middle of the resolver cable just have a bunch of insulated quick disconnects (the male/female spades) which makes it easy that way to swap them if necessary too.
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