Thanks for the reply again
I am making an adaptor harness and would prefer to keep the rest of the harness as factory so if I ever want to take the link out and revert back to factory ecu I can.
Yes I have worked out the ecu hold power circuit so that the igsw connects to a digital input and via a diode initially powers the ecu then when the ecu is powered up aux out holds on the main relay. It’s just that the factory ecu puts out 12v to the main relay down to ground.
the iacv is of the factory stepper motor type (6wire), in the link help manual it says that aux 5,6,7,8 must be used to drive this, is this the case? as it’s only being low side driven, if I could move the stepper motor away from these aux then I could use the high side drive capability of these aux to power the main relay.
Alan