I'm working on a project at home that uses a 25.2V Center tap 2.0A transformer. Prior to plugging everything in I used my multimeter to check the connections to make sure there were no shorts. I immediately found a short when I touched the meter (in continuity mode) to the two prongs on the household plug. I traced it back to what I think might be the transformer. The transformer has two black wires on the primary side and three (2 yellow, 1 black) on the secondary side. When I put the meter on the two black wires in continuity mode the buzzer goes off. I assume that is not normal, correct?