Eagle High fits for 250AMP High Output Alternator 4 pin plug For Chevy Silverado Pickup 4.3, 5.0, 5.3, 5.7, 6.0, 6.5, 6.6 Duramax, 7.4, 8.1 liter (1999-2005) 8292 Top quality part Made with the Highest Quality Part Please run 0 or 2 gauge wire from battery positive to behind alternator post and leave original wires too and you have good strong new batteries Computer tested for consistent Quality Meets or Exceeds Original Specifications