Finally got myself into gear and got the alternator out of the MR2. Unfortunately that type isn't made any more and since there are more honest MPs than there are 4A-GZE engines in the UK, I'll just have to get it rebuilt. In the process of getting the alternator out I had to take the A/C compressor off, big heavy thing it is too. I had the A/C de-gassed a few years ago intending to remove it to reduce weight, but never got round to it. I guess now is as good a time as any.