Altenator
If you can do a timing belt, you can change an alternator.
There is a way to drop the alternator out the bottom of the car---front clip in service position. But I don't know how. I saw it done.
Yes replaced from underneath, had done at dealership that I work at. -think it was only an hour labor or so.
Something to look forward too...new factory alternator brought new life to my S4, felt more powerful with electronic system back at spec.



