I believe the Sparx is pretty much the same as the high output
Lucas, but with a solid state regulator/rectifier.  I haven't
used one, but have used the three phase Lucas alternator with
the three phase Podtronics regulator/rectifier.  The
connections are the same,  three wires to the alternator and a
positive to ground and a negative to battery.  
The ground I referred to in my previous post was from the
headlight to the chassis/head.  
Ron L.