My Son tested mine using a drill, "V" belt pulley, "V" belt and ammeter. But he was just trying to work out the wiring of the alternator. (He's a HD Diesel Fitter)
Hi, I used Sahib’s at 3 Norbreck Parade NW10 7HR to fix the alternator from my MD5 but it was quite a long time ago. They are on a parade of shops by Hanger Lane gyratory system. Tel 8997 8232
Thanks philweb for the recommendation of Sahib’s, took it there, tested whilst I waited, confirmed diodes had failed, could have repaired whilst I was there but did not have time, picked it up today looking like new.
Very knowledgeable guys, very professional as well and well priced.