My original adjuster had already been through the "Break,weld,break,weld" cycle. What made me replace it is the very limited adjustment range. Sometimes you just don't have access to exactly the right belt.
GM's 10si alternator is VERY interchangeable internally-you can mix and match parts and build what you want. I found a 100 amp one-wire 10si on ebay for about $68.00,so I'm going to be trying one on my '54 GMC 2 Ton,and if it holds up well,I'll eventually get everything converted to 'em.
You can still buy high amp alternators off the shelf at parts stores,but the "computer readers" at the local parts store can't actually find 'em for you. The software doesn't give 'em the amperage-it only lists 'em by application,multiple choice. You need an "old school" parts man who can look it up in the books. (NAPA is good about this.)
Anyplace that sells and rebuilds alternators and electric motors will be able to hook you up with almost any pulley you want. I've come to a point that I like the 10si MAINLY because they're so easy to find and not expensive.
