Engineer-Joe posted:just to be clear here, you're just testing for +12volts out?
Most users will know if the TIU doesn't put out voltage. Is there a condition you're looking at that puts out partial voltages?
A meter or MTH PS2 or 3 engine could tell the user what the track voltage is.... right? or even a light bulb?
Adrian talks about DCS signal in volts not to be confused with volts used to run an engine.
He should be able to explain it better