commentor2

Older house (1940s) on the US east coast, trying to replace a simple light switch with a motion sensing switch that wants a ground and got some weird results.

The box has a white, black and bare ground wire coming in. With the breaker off, (A) measuring DC resistance between the white (supposedly neutral) and the ground is near zero as expected, and with super high resistance between any other pair. But with the breaker on, (B) my non-contact voltage tester alerts on the white wire! And the voltage can only be found between the white and ground, not the black and ground. If not for (A) I would think the black and white were reversed. Very confusing.

I tried wiring it both ways but

What do you all expect/want when I get this? I have tried a few different approaches, and have kind of settled on answering on the first frequency and then again on the second with an altitude report. Is this suboptimal?

EDIT: thanks everyone. So the derailleur hanger was a little out of alignment. I fixed that and adjusted the B-tension to close the gap between the top jockey wheel and the cogs and it is much better, at least on the repair stand.

Original post: I have an Ultegra 6700 bike with about 3000 miles and have just replaced pretty much everything except the rear derailleur: shifter, cable and housing, chain, cassette.

No matter what I do with the cable tension, rear shifting is poor. It sounds and feels good once in a particular gear but going between cogs often requires over-shifting then going back. I have a newer bike with 105 that is much better. Is it possible the derailleur has w