I purchased a 250 amp Sinister Diesel alternator that only lasted 8 months after it was installed. Even though it was past the purchase date not the installation date they were willing to make it right. Now after them sending me 4 wrong alternators. They don't know what to do so I'm playing the waiting game. The old style alternator is no longer available and the new style will not work on a 2007 Chevy Duramax Lt classic. The owner said he will make it right. So will see.