I just moved my battery to the trunk of my nova using a 1gauge starter wire and a 2g wire for the block ground. Now I am about to get a new one wire 100amp alternator and it says the sire goes straight to the battery, so do I have to run another large wire back to the battery? or can I just run a battery to the existing wire on the starter terminal? Also, if I do have to run another wire back there, should it be larger since it will be about 15 feet long?

Thanks,
Eric