Evening guys and girls Just a warning for the Bosch alternator that is on the fabia vrs and other fabia models , it has a pulley that drives it that has an overrun feature, this pulley on my car has done the opposite of seizing up it now freely spins each way while barely spinning the internal stator … causing the alternator to not charge the battery this has in turn had me changing the voltage regulator and diode bridge rectifier on the rear to try and solve my problem as I had checked the ohm readings on each coil and each where working fine , so please be wary as alternators are not cheap now and this is a very simple fix that with the right tools And parts can be done for less than £40 

kind regards 

thomas aspin 

the overrun pulley looks like this ^

That was a very unfortunate failure mode, I would have expected it to have made a lot of noise.