+12V current is sourced from the ignition switch, flows through the coils and sinks in the igniters. The igniter is just a high current transistor that can sink the coil's charge current.
The DME does not power the coils... it just *GROUNDS* them to complete the circuit.
"Smart" coils have the igniters built in as you mention. That means they need a +12V power, +5V control signal and ground capable of sinking the charge current.
The DME does not power the coils... it just *GROUNDS* them to complete the circuit.
"Smart" coils have the igniters built in as you mention. That means they need a +12V power, +5V control signal and ground capable of sinking the charge current.
















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