I have a series 1 GTV that has had Marelli electronic ignition fitted. I had the unit in pieces recently waiting for a new control module to arrive. Now I cant remember which way this should be wired to the coil - it appears to work either way, but obviously it needs to be correct. The control unit had a red wire and a black wire going to the coil - labelled B & C at the module end. Does anyone know for sure which is + and -.