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The Wires off the coils marked BK(black, pin 21) BK/YL(black/yellow, pin 9) BK/WT(Black/White, pin 10) are the signal wires to the ECU, in my car it is all located in the slot in the ecu labeled "Kammer E" which has around 48 pins(all numbered). The other wires that go to the circuit marked "x12" along with the injector wires are all for power it seems. The coils ground on the valve cover. Hope that helps.
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