I recently got an 03 Weekender with a bad alternator, and took it to a shop to replace before reading this thread. They added a 90A one (as per the recommended specs according to the mechanic). Well, I have had issues with it not charging enough even the starting battery with load at idle. I took it back to the shop to see if I could get them to upgrade at a reasonable price, but the price for the 120A bump was I think 260 more. I have been wanting to get a 220A one and found one off of a 2017 V6 at a decent price (at this point I am not positive whether it will fit) but the mechanic got me thinking of something else: when he mentioned the only possible upgrade was the 120A he cited among other things the wires running to the battery. I know you mentioned swapping the pulley, but would I need to upgrade them as well is I go with a 220A?