Hi All ,
I have a Knocklink G4 knock sensor ( this is not linked to the ecu ). In the manual it said it need a 12v feed to the red wire for the control unit and the blue was for the ground. The remaining two wires yellow and green were to be connected to the knock sensor, in any order according to the instructions.

Its wired to the switched 12v from the radio and both the ground from the radio and the body were tried. The sensor flashes blue green for a millisecond and that's it.

Is there something incorrect or would it be a faulty unit?