[Healeys] Fuel pump problem

[Quentin Schweninger]

Need some Help.
I am assembling a square body fuel pump for my BN7. I purchased the  
pump in pieces and am replacing the points with an
SU - Burlen solid state Electronic conversion Kit.
Their instructions reference the coil wires as Red + and Black -. How  
ever,they state that some older coils have two black wires. So mine is  
"older".
Does anyone know how to determine which coil wire is positive?
  Thanks
Dave and Daisy