I don't want to sound real negative, but I will share my experience. My original alternator, Leece Neville crapped out at about 165,000 miles. I bought a brand new, exactly the same model from AJ, installed it and it lasted less than 2500 miles, since I was within driving distance I took it back to AJ, he tested it and confirmed it burnt up. Although he replaced it under warranty, he insinuated there had to be something wrong with my coach's electrical system. I asked why had the first one lasted so long then, no answer. The second brand new replacement lasted 4500 miles. I then installed a brand new Delco 28si that has been bulletproof for over 20,000 miles. Come to find out his "brand new" Leece Nevilles are built by him at his shop in NC. Just my experience, take it for what's it worth.