Alternator upgrade

Guys need help with a alternator upgrade. 70 challenger 340.has a low amp alternator. Running fitech, electric fans ,fuel pump.its a 2 field alt plus power and ground. Have a 100 amp I want to install but has only 1 field +power and ground.both external regulator.how do i wire the reg?2 wires from it.thanks for the help.
Author: Fer_