Where does the voltmeter get it's signal from? Mine has been reading low for awhile but recently has dropped down into the red. I don't think there is a problem with the alternator as the vehicle starts just fine every time, so I think it is just a bad signal to the gauge. It could be the gauge itself as I have had connection problems with the gauges before but typically when it happens it is either the 4 small gauges, the 2 big gauges, or all the gauges. I have not had only 1 gauge have a connection problem, but I can't rule it out.