I'd be surprised if there's no wiring overhead. Swapping mirrors at build time is trivial, but installing different wiring harnesses when other stuff needs power makes little sense.
Please see my thread on hardwire with a power source in the fuse box.All good but.......if no Auto-dim mirror up there, no power I assume.
Where else can a guy go?
Great write-up.....kudos to you.Please see my thread on hardwire with a power source in the fuse box.