About 31 years ago for my wife's and my anniversary, we bought our selves a battery charger. We were poor, drove junk and had three under 12. It was a big deal for us, about 150$. A century battery charger with 6volt, 12volt low, 12volt hi and a 6v12v boost. Its worked well until now. At 6volt it shows 6.9 dc volts, good for 6v batteries, but at 12v, hi or low, it only shows its putting out 9.6v dc. Is our anniversary gift now only useable on 6volt batteries or is something some where preventing it from charging at 12.? vdc. The little meter needle has not worked for some time, if that makes any difference. thanks gobble