Just get an aftermarket high output alternator, most of us around here need one of those anyway.I was going to explain the charging system being insufficient too but the quote Jroo posted explained it way better than I could have. After learning about an agm needing a specific charging profile I now know I'll probably never run another one in a vehicle unless it came with one from the factory. My truck came with a wet battery and periodic voltage checks while driving have showed it never gets over 14v. In previous trucks I've seen nearly 16v from the alty when under heavy demand on a volt meter in the cab. I have an agm as the cranking/acc battery in my boat but I also have an onboard charger designed for it that makes sure it's fully charged before the next trip. A wet battery will be going in my truck when the time comes.