There are four terminals on this model transformer: A, B, C, & U. To the best of my knowledge, A-U & B-U could be used to power trains or accessories. What is the purpose of the C-U connection. I have tested the voltage on A-U & B-U output terminals and they are producing the correct voltage. However, the C-U terminal shows no voltage. Can anyone advise regarding this matter. Thanks.
Sincerely,
Rick Perrotta
San Diego, CA