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If it's not really about tuning or wiring. Then it belongs in here.
I have installed a nos system on my car, i am running a motec m600 on the car. I have connected both the fuel and nos solenoids to a switch and the other part of the wiring to an aux output, everything worked fine but the problem is when i checked the pin of the aux output, it had some current running through when the switch is turned on ( even when it is a ground ) so does this effects the ECU, can it damage the ECU or is it normal?
Due to the way that the pins are driven, it is possible for there to be a small voltage floating on the pins.