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Just to close the subject, the red one comes from the blue/brown wires from the ballast ? if so voltage drops when hot ?
Dan



Yes. You take your old coil + and connect it to the small red wire. Think of the small red wire as the activation voltage for a solenoid. All it does is turn "on" the MSD box. It doesn't pull any real juice, as long as the small red "senses" a 12v signal it will turn on the box.

-Jason