I have four circuits passing through a TIU. Recently, the circuit passing through position 4 stopped working. As I apply power to this circuit, the Z-4000 shows amps increasing to about 8 as the voltage reaches 12. And, the track that is serviced by this circuit shows no power. So, I moved the input/output of position 4 to position 3 on the TIU and the circuit worked fine.
I would appreciate suggestions on what I should try to fix the problem. Perhaps I should send the TIU in for repair or just buy a new one.