I don't make a lot of personal posts so please bear with me. #Rufus hasn't been doing well for the past week or so. I mean, he's 13 (at least), and has slowed down due to age, but the past week or two he's been acting like every movement is a Herculean effort. A few times in the past couple of weeks his rear legs have given out on him completely to where I've had to pick him up and carry him which is, in itself, telling. Rufus has always hated being carried and struggled continuously when I did so. Yesterday while petting him I noticed two golf-ball sized things up under his chin. Now, they may be benign lipomas as Rufus is covered with them (one one each thigh, one on each shoulder, one on his chest and a few smaller bumps here and there) or they may be indicative of something else. I'm no vet and aside from emergency medic battlefield training I have no medical experience whatsoever, but these new things seem to be where your or mine lymph nodes are located....
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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.