The back of the alternator was a little different to the 55 Amp alternator I already had, it had a few more terminals, terminals differently marked (to my eyes) or with different fittings etc I was a bit concerned that it may be useless to me but I remembered that some blokes had put a heap of information up on oldholden recently and so decided to check the holdenpedia. This page: http://www.oldholden.com/possible/index.php/Alternator was a life saver so a big thanks to T, merc9112006 and Qute.