What about the blue wire ? I think that it is for the ignition. I have one green wire that goes from the reg. to the alt. and one blue that goes from the reg. then splits to the alt. and goes to the ignition I think. Thanks for the advice on wire size I had some work done to the alt. at a shop and he said it put out 87 amps. at 3k so I used #10 wire. I found an 140 amp. at Summit in the bargin section for $75 looked it up in the book and it was $189 so I couldn't pass it up. It is not a mini and I run a Meziere water pump so now I have to come up with some way to mount the thing.