Re: Generator light coming on
The VR itself has temperature compensation, but the whole shootin' match is dependent on the voltage "setpoint" being adjusted correctly. Ordinarily shouldn't have to mess with it. Unless somebody previously really buggered it, I doubt that's the problem.
Charging voltage is temperature dependent, but it is automatic, because of the bimetallic spring or whatever. Generators have a notably higher charging voltage than alternators. The published set point or charge tables were also printed in the days of analog voltmeters. I don't know if that makes a huge difference or not, but generator charging systems are normally in the 14.x to 15.x volt range and even higher in subzero weather.
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