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Hmmm.... Do you have the original pigtail for your Gentex mirror? I would assume the connections are the same with the wire nearest to the center is 12+, the one next to it on the left is neg and the 3rd one would be the equivalent to the ground for the reverse.
Unless the car's wiring hooks up to the last three near the driver's side which in turn only powers the lights, meaning that you're also not powering the auto dim feature since the compass doesn't light up. Because you don't have the temperature, your lights may be wired up in where the temp would be and I feel perhaps the Donnelly wiring is different from the Gentex, being mirrored instead of pnp. It might be something to look at. Bench test that Gentex with just the last 3. If the lights work but the compass does not, there's your problem.
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