I'll test each terminal to body of thermo switch anyway just to be certain and check the wires are in the right place. The plug on the pressure actuator has been changed aswell and the colours are different. Does the polarity of that circuit matter? Im wondering if the 8v may be getting pulled down by the pressure actuator itself if either of those pins have a path the ground? Seems strange how it shows 8v until plugged in, then 1v, unless the ECU is clever enough to give a BIAS voltage on the circuit when unplugged?
thanks