There is a gentleman over at The Diesel Place Forum who has put together a kit for Duramax pickups to add an additional 105 amp or 130 amp alternator. The kit uses all GM original parts, and wiring harness, and looks factory. I am not sure if the kits are available for other engines, but I imagine they are. If anyone wants more info, check the website or PM me. I am not affiliated with him at all, just posting an FYI.
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ARS WA8ZYT
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce! Air # 283
WBCCI 1350
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