Upgrade the alternator in your 2007.5-2010 6.6L GM Duramax with this HD 220 amp alternator from XDP. Factory charging systems can be easily overwhelmed with aftermarket lights, stereos, horns, and other electronic devices. The HD Alternator from XDP will provide a substantial gain in output amps that will be able to handle the abuse of aftermarket electronics. The wrinkle black finish adds corrosion protection and enhanced looks. This alternator is pretested and ready for installation using factory mounting location and existing connections.