September 23, 200322 yr I am kind of baffled. When my car is just cruising along, the voltmeter will sometimes fluctuate by a few volts. At idle, the voltage will fluctuate more, occasionally going down below 12 volts. Regardless of engine speed, the turn signal or brake lights will cause a voltage fluctuation and a slight dimming of the headlights. Voltage regulator bad? Alternator? Something else? It's got an almost new Optima battery in it.
September 23, 200322 yr this is a good sign your alternator is going bad. At least its not going up in voltage and not stopping because that can start to fry major electrical parts. I know if your alternator goes bad and you have a digital dash, it can sometimes take a toll on the dash which we all know, is not a very cheap part:banghead:
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