>
> I just got back from a long round trip between NM and IL. It was really cold on the way back, -6C on the ground (cabin heat would have been nice).
>
> I noticed the voltage in the electrical system oscillating between 11V to probably more than 16V. The load did not seem to matter. The last leg of the trip was considerably warmer and the voltage was 14V solid as usual.
>
> Is this the symptom of something starting to fail or only going to happen if it is real cold?
>
I fly in CAS (Cold As Sin) temperatures here in northern NM (I'm in Santa Fe) all the time in winter with no varying voltages like this. I did an xcountry today to Taos and back, the OAT read 21F enroute at 10,000' MSL and I didn't see any abnormalities on the EIS. There sure were abnormalities in my toes and fingers when I landed in Taos, and back home, tho (I really need to get off my butt and reinstall the cabin heat ;)).
Sounds like either the metering you're using is going flaky or indeed the voltage is varying. The crappy Ducati regulator usually fails open which would give you a constant 12v until the battery starts to run down.
But it doesn't sound normal for sure.....
LS
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