A good alternator with internal regulation will easily put out 13.5 volts. No problem. No internal regulation will get you 16-18 volts. Blow up your battery.
One wire setups are OK for hotrods only run on weekends. It will eventually discharge the battery over a long period of non use. Three wire setup is what you want for a daily driver. You may have to change over your keyed switch to one that will accept the 3 wire setup.
