This is a really useful thread, thanks. However, I'm still having some trouble understanding when I look at what I have to work with on my GT6 MK3. I am chaning my alternator. My new one is what looks like European Terms, upgrading from the standard terms - as per your kindly posted wiring diagram, thanks Chris.
However, it seems I've got more than three wires, and I'm not sure which is which. Remember I'm a newbie please guys. Electrics always scare me a little to be honest.
I would really appreciate any help at all. I ordered one of the plugs you see in the pictures. I suppose what I'm asking is which three cables do I put in them, and what do I do with what's left over?