Quick question Re: Alternator wiring

[Ultrasummer]

I've read most of the posts and haven't seen an answer for this. So I put a new alternator in. Traditional 3 wire type. I went from the original 55 amp to 100 amp with internal voltage regulator. From what I've read at about 100 amps you should consider going with a heavier gauge positive wire. I bought a 6 gauge alternator cable for this. I also bought the handy dandy wiring adapter that is 2 pieces: One is an adapter that plugs into the alternator and connects to old wiring and the Second is a plug that goes in place of the previous voltage regulator. Handy huh? While looking at VetteVet's great illustration of wiring, I am running this new 6 gauge wire to a junction block that will in turn run over to the battery )or junction block near the battery). Now I've got the previous 12 gauge POSITIVE wire coming from the old external voltage regulater that came from the previous attachment to the alternator. What should I do with this 12g old positive wire??? I was just going to go ahead and attach it to the junction block where I have the new 6 gauge wire attached unless you all think it isn't needed.