Take a look at the following site: they have some really helpful info about one wire alt.
http://www.powermastermotorsports.com/faq_s_-_chrome_alternators.html
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.