Just a Suggestion here ... I went to the local auto parts store and bought a GM Delco alternator for the same year model as our truck, but a 3500 series with the 454 ... same bolt pattern and location ... but a 140 amp alternator instead of the stock 80 amp ... I am charging 2 battteries up front and 3 Alpha Gel Cells in the battert bank in the bed ... Going on 2 1/2 years with NO problems and minimal times on the battery charger (only nights before shows/events) and sometimes I forget to do that. Hope this helps some ... Again, just a suggestion ...