I was wondering what h/o alternators are available and the part #'s or where to get aftermarket alternators at a good price?

 

There's a part number for a Denali 145 amp alternator HERE

I got my 145 amp alt at G&R Auto Parts for about $100 in one of their ebay auctions

 

There are numerous, extensive threads at the ChevyAvalancheFanClub.com web site on this very topic. There are at least 3-4 different brands of aftermarket alternators with plenty of experience on all of them. Lots of links and pictures. You may have to register in order to perform a search, I'm not sure, I don't remember (been a member for 2+ years).

 

I 'll check it out

 

I replaced my oem 130amp with a 210amp from Alterstart. The original lasted about 60K and the replacement lasted abut 50K. They both had voltage regulator problems where the lights would dim and the voltmeter would bounce even while driving on the highway with cruise on and no new electrical demands. Replacing it solved the problem both times. I replaced the second replacement with the HO Alterstart and have had no problems in almost 40K so far.