Alternator Rebuild

[Gav1234]

Hi , I have a 86 325I which does not appear to be charging or outputting any current into the blue wire either.
When running the car is at 12.5 volts across the battery terminals and at the back of the alternator.
I have replaced the brushes that are held in at the back of the alternator already so I need to strip it down to bits and see what's what.

Are there any good step by step guides anywhere with values and resistance's ?

Thanks in advance

[Brianmoooore]

Check that there is approx. 12 volts (measured with a meter) on the blue wire with the ignition on and the engine not running.