Good day all. I have a Powerstat Variable Transformer that I picked out of the garbage and have been playing with. Looking at the diagram on the front of it, it appears as though input goes hot to terminal 5, common terminal 2, and terminal three appears to be the varying voltage. My question is, why is it that my meter reads voltage on terminals 1, 3, and 4 when I touch only one lead ( red or black ) to it? The voltage is different between the red and black, however, they both still register a + voltage. Thank you.