200tdi ayre
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Is it easy to change?
We had a similar problem on one of our tractors was discharging slowly over time but not putting out a wrong voltage. Changed the whole alt as we couldnt get a diode for that alt. Fixed it .
The diode only allows charge to flow one way so it chatges your battery when the engine is running but doesnt discharge when engine off . If it was the regulator that was knackered it would be putting out the wrong voltage.
The diode is abit harder to get at than the regulator it may be in built to the casing may be seperate and removable