The MERCURY Coil Driver is designed for coils without electronic drivers built into them. It is only recently that new generation engines have built in coil drivers. Some cars today still requires external drivers to determine and control the charge current for the coils. New generation coils also bolt onto the plug eliminating the need for high tension leads. Most manufacturers prefer to minimize electrical interference.
The Mercury ECU can drive coils with built in drivers directly but you have to use the external Mercury coil driver for basic coils. This driver comes in 2×2, 4×4 and 6×6 driver configuration. This means each driver has a trigger signal. If you have for example a 4 cylinder with 4 coils you require the 4×4 driver. The mercury may be configured for wasted spark or single coil. If it is wasted spark then 2 of the trigger pairs will be connected together. That means there are 2 trigger signals from the mercury and they will got to 2 trigger wires in the coil driver. This will split 2 triggers to 4 coil drivers. See the wiring diagrams on these connections.
The Mercury coil driver use a specialized component that can drive the primary up to 360 Volts creating a 36 Kilo Volt output on most coils. The driver is current limited to 10 Amp and has a soft discharge feature should the ECU not trigger it within a certain time. It has over temperature protection that will prevent overheating of the driver in long charge time duty cycles.
The driver requires a positive signal to charge and a negative transition to fire the coil.
To learn more about this amazing package browse through the features and specifications in the sub folders.