Hi people my friends battery light has just come on there 2ltr diesel Ford Kuga.Ive been to have a look at it and when you start the engine the voltage is about 12.50 and rises to 13.50 volts.If the engine is reved the voltage goes to about 14v then drops off.Ive check the voltage from the back of the aternator so I know the wire to the battery is ok.

I take it its a faulty alternator.