Nosso replacement for the original Bosch or Norris Starter Regulator. Please Note the fixing hole centres are not quite the  same and more importantly the connection layout is different so look at the numbers and connect carefully as per the instructions shown above. A Translation of the Argentinean instructions in the box is below, it may or may not help you? "POLARIZE Once everything is connected and before starting the engine, polarize with a spark between "D" and "B" TERMINALS. A direct ground wire between the regulator base and the housing of the dynamo"