NEW BOYER BRANDSEN VOLTAGE REGULATOR. THIS WORKS ON ANY LUCAS 6 VOLT POSITIVE EARTH DYNAMO/GENERATOR. PLEASE BE INFORMED OF WHAT YOU HAVE BEFORE YOU BUYTHIS ITEM. IF YOUR HAVE A 6V NEGATIVE DYNAMO YOU WILL NOT BE ABLE TO USE THIS. IT WILL ALSO NOT WORK FOR ANY12 VOLT SYSTEM. THE UNIT HAS DIRECTIONS. THEY MUST BE FOLLOWED CAREFULLY. WE SELL THE REGULATORS FOR OTHER SET UPS IN OUR STORE. PLEASE FEEL FREE TO ASK BEFORE PURCHASE.