Replaced an old 912 with a new rebuild 912. new one is very nice and smooth, I have not flown it yet. My problem is that when I have run the engine for a couple of minutes , I switch from Battery to Alt. and then in a minute or two my low battery indicator on the EIS starts to blink. If I stay on Battery the Low Battery indicator does not come on. Any idea what is going on.  Voltage drops below 11 volts when in the ALT position. In Batt position is stays at 11.7. Could it be my battery. its 5 years old. (oddesy 625)

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