Never had a problem of that nature on a Yeti. But on other cars with similar from time to time, but so often these days). The basic principles of electrical systems and how they work has to similar. Due to the same physics being involved. Lots of alternator manufacturers also supply all sorts of different car makers/assemblers.)
Agree with Mark, The Hood and Robjon, first thing to eliminate would be the engine earth strap. And cheapest to fix.
After that, still not necessarily alternator itself. 8 times out 10 more likely the voltage controller pack starting to fail. Some designs that is mounted separately (so subject to less heat). Others, usually older designs and/or those made by Lucas, can sometimes be found bolted to the back of the alternator itself. Under a black plastic shroud.
If confident enough with electrickery to be diagnosing DIY, should be possible to reach the ‘tater adequately through the wheel arch? Rather than taking a rad out? (There are three of those anyway, stacked like cards. Air con heat exchanger, intercooler for intake air, coolant rad, nearest engine. So not the most speedy of jobs for all three. But I have swapped the coolant rad on my first Yeti. Not difficult, just time consuming.) The arch liner should take out easy enough, with the wheel off first. Expect some of the holding screws to be rusted/seized perhaps? Have some replacements ready?
if not DIY then I also agree take it to a professional auto electrician. Rather than a general mechanic type garage. Definitely not a dealer. Many of those latter in my experience know even less about auto electrics than I do. Even if you took the car to a dealership, they would quite likely sub-contract it out to an auto electrician while you were not looking.
