Tuff Stuff 7127ND Chrome 100 Amp 1-Wire Alternator for GM Vehicles - High Performance Replacement for Chevy, GMC, Cadillac - Ideal for Off-Road, Hot Rods & Classic Car Restoration

Does what it's suppose to do . Charges at 13.9 -14v works best at 1000rpm at idle . I used this unit to update from a generator . The truck it's mounted in has 2 air compressors running pretty constantly and the battery is staying at 600 CCA's . A+++ so far . Still need to test longevity .