amp gauge???

daredevil said

just indicating its charging.Any electrical upgrades like fans or amps or anything? unless its pegging out or discharging I wouldnt worry. Maybe the gauge is weak.

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From his description it sounds more like a bad regulator.

When you say it "keeps going" do you mean that as you give it more throttle it just keeps going up?

You need to get a voltmeter on the battery with the car running and see what it says, pronto.