I'm shutting down Google+ for the night and quite possibly for the weekend. Why? This stupid #gifwars thing people are so proud of. This Adam Black guy said he doesn't like gifs and now everyone is mass trolling him. Having been mass trolled like this I can relate to him easily enough. Have an opinion and the collective might of Google+'s lower class denizens jump on a bandwagon. I just saw a post where someone wanted to jump on board and had to get clarification she was tagging the proper Adam Black. She wasn't even connected to him ! Nor was she a part of the original discussion. She just wanted to follow the herd. When I called her out of it she claimed, "one gif doesn't make a troll." Perhaps not, but she's contributing to a larger troll effort. One straw doesn't break the camel's back, but thousands will. So, tonight, Google+ disgusts me. It probably will tomorrow as well. And possibly Sunday. I gave up Google+ for two months this spring
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After that the voltage needs to be "regulated", limited to probably around 14V, because that should be the max voltage for a 12V lead acid battery.
In your case, John Nelson, it could be that either the voltage is set too low or that the transistor they use in the regulator does not allow much current to go through. If your garage agrees, I would suggest to ask if they let you try one of those "MOSFET" regulators for a week. The difference should be obvious.