I have a Powermaster 100amp racing alt with one wire. It is hooked into a Painless wiring harness and MDS digital ignition, dist and coil. Plus elec fuel pump, fan, h4 halogens, etc. Have 13k on the car and it runs fine.
http://www.powermastermotorsports.com/
As Mr Fixit says, you should check with someone who knows before you just install one of these things.
Roscoe