Update: suspicion was correct:
Broken wire on multi function switch stalk
After more searching, I found a great YouTube vid of diagnosis and wiper motor replacement. I also found a good one showing replacement of the mfs
I checked the relay function and resistance a little more. I could have done more searching for a short, but I decided to go on my hunch that it was the switch bc the turn signal was broken anyway. I also found a couple videos/posts that showed a broken wire; so it seemed somewhat likely
Definitely get the t10 torx driver for this. T30 driver might be too long to fit behind wheel and clear the dash. I used a folding set for that one
Lots of precautions to take with airbags, angle sensors, and old plastic clips. I followed instructions on the vid. I did crack the steering wheel function plug on the back of the airbag. It’s supposed to just pull off, but it has a catch that I did not release. Never figured it out, but it didn’t break all the way, so I plugged it back in and reused it
Replacement mfs came from rock auto. I believe it was listed under standard replacement and was a valeo OE unit with mercedes benz branding on it. About 60$
I think there are updated ones with shorter wires, but I don’t know how to find those
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