Alternator Change on Powerstroke?

A basic question on changing out the alternator on a 7.3 liter powerstroke engine. I've got a 1999 Ford F-250 and I want to pull the alternator to test it. I've given it a quick glance and it looks like pulling the unit is pretty straighforward and on top (versus hard to reach). However, in order to loosen the serpentine belt, where is the adjustment (tension) pulley? I don't want to turn more bolts than I need to....thanks in advance
Alternator Change on Powerstroke?
The last answer raises a good point - most charging problems can be tested without removing parts. If you do want (or need) to remove the alternator, get a breaker bar with a 1/2 inch drive, seat it securely into the tensioner opening, and get a helper to hold it with 2 hands to loosen the belt. Remove the serpentine belt from the alternator pulley and leave it hanging in place - it will make it a lot easier to re-install if you don't completlely remove it. Taking a couple photos of the belt in place is a good idea if you have to remove or replace it, they can be tough to figure out unless you have a diagram.
Alternator Change on Powerstroke?
Mine is a '94, tensioner is located between the alternator and power steering pump, the belt runs underneath the tensioner. I use a fairly long bar, it takes considerable force to push it up.
Look for the pulley bracket with a 1/2%26quot; drive square in it. Use a breaker bar to pry it back to release tension on the belt.
Take it to a shop, they can test the charging system without a turn of a wrench !!
jac 1067 is correct.... actually if the truck was never wrecked, there should be a sticker on the radiator support or the hood that tells the size of the ratchet head and the direction you need to turn it in to release the belt.