Not to be a complete naysayer, but when my original alternator quit at 165,000 miles, I bought a replacement from AJ Electric. It was supposedly a brand new exact replacement Leece Neville, it lasted 6000 miles. Seems he builds the alternators in his shop with parts he gets from where? AJ Electric replaced the alternator under warranty, and told me I must have problem with my coach, couldn't be the alternator. I checked my coach over and over, there were no problems nor any changes, I checked connections, even to the point of replacing batteries that still checked out fine, but were getting older. That alternator lasted 2000 miles and quit. I don't particularly think that is a good record. I have since replaced the Leece Neville with a Delco 28si and could not be happier. This alternator has been in service for about 8000+ miles and has been perfect, also the 28si is smaller and lighter and after replacing the alternator ourselves numerous times it was very welcome. Parts are readily available. Just my personal experience, take it or leave it.