14-08-14, 09:46 AM
The coil(s) will always have 2 wires going in and the HT lead coming out. There will be a permanent 12V on one side of the coil primary and the other side will be pulsed to ground either by points or an ECU of some sort. The relay goes into the permanent power side of the coil. The only exception to this was some older Lambrettas and mopeds that used a generator coil to give the power for the ignition and they had a wire from the generator coil to one side of the points (which were insulated from ground), the other side of the points went to the ignition coil primary with the other side of the primary grounded.