bought this today connected it up but no spark anyone got any ideas, connected the red wire to the battery which ran through a switch, connected the green and yellow wire to earth and the blue to the positive of the coil and the other side of the coil to earth but no spark at all anyone tell me where we going wrong cheers oh yeah and when we connect it up the blue and earth have 12 volts comming out of them when the red is connected to the battery which we thought was weird but when we connected one of them to the coil the 12 volts dissapeared