One Wire Alt to Battery in Trunk?

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

Connect your charge wire (6ga is what I use) to the lug on the starter solenoid.

It will share this 1ga cable to the battery with no problem.

The manufacturer of the 100amp alternator suggests you connect to the battery because of a probable limitation in stock wiring. Since you have better-than-stock wiring, it should not be an issue.

Remember to tap the gas to get the charging system running after you start the car (bad habit of one-wire alternators).