Well since this was the thread that really got me thinking about alternator upgrades, I thought I'd add to it.

I looked at the options listed here and went with the 140a Powermaster GM alternator upgrade that was linked above and I dove in and did it:

85 Toyota 4Runner Alternator Upgrade Project

I chose the Powermaster since people seem to be happy w/ the GM alternator upgrades, they are used in a lot of the on-board welding kits, and because Powermaster does some upgrades for cooling and they have a good reputation.
The Mr. Alternator seemed great since it was bolt-in, but I haven't heard much about them before, and the specs didn't look like they put out as much juice at idle (where I really need it).

Anyway, that linked article was very helpful, and I found much easier way to mount the alternator. I posted some pics and info in this thread:
http://www.pirate4x4.com/forum/showthread.php?t=451359





I've got it all wired up and it seems to work great. I turned on my hi & low beams (at the same time) and two 50W rock lights and the voltage only dropped from 14.7 to 14.5 at idle. This weekend I'm going to get my other two rock lights put back in and then take some actual current measurements with every electrical accessory I can think of turned on just to see what its actually putting out. <img src="/forums/images/graemlins/smile.gif" alt="" />