I am trying to check the operation of pre and post cat sensors on a 2005 Forester 2.0. The pre cat has 4 wires, 1 Blue, 2 Black and 1 white. White is earth, blacks are heater wires and Blue output. The Blue has a constant Voltage of about 2.7V with the engine running. White is Earth. One of the blac...

I apologise in advance for what is probably a stupid question.Quiet new to picoscope but have used successfully over the past few months. Just trying to do a basic battery voltage / charging check having recently upgraded the software and I am struggling to get any sensible readings on the screen. C...