I connected it directly first and then connected it to the ignition switched positive line that was going to the MSD 6al unit. It doesn't have a ballast resistor in it at this time. So I am going to call msd tomorrow and ask if I need to put it back in until get the 6AL unit back. It runs fine, but I it dawned on me that maybe it should have the ballast resistor in. Does anyone know if it is ok to run a msd 2 blaster coil without a ballast resistor ?