text: I remember that the auto Xfmr (buck/boost) has standard input terminals then a series of terminals based on the voltage range you are looking for. Look at the connection diagram shown on the link below.\n\nYou want to have the Xfmr setup to Figure C where you have input on H4 and X1/X3. The Xfmr is jumpered between H3 to H2 and H1 to X4/X2. The Output comes off of H4 and H1. H4 terminal would be considered common. Monitor the output voltage using a trusty DVM, don't ever go by the info on the Xfmr.