TIU not finding protosound 2 subways on track 2

Could be that the signal is weaker on the second track?  What does a signal strength test with one of the PS/3 subways there show you?

How would I test the signal strength?

I judged tested the track signal it’s all 10’s. Any other thoughts? Thanks again!

Try switching the connections  so that track 1 is now being fed by by what was formerly outputting to  track  2.  If the ps2 subways are not being found on track one now using whatever tiu output that was formerly powering track 2 (and if the ps2 subways are now found on your track 2 utilizing the formerly track 1 output) you now know it is not a track issue but may be an issue with that particular tiu output.  If that is the case, I’m sure people here will walk you through on how to check for a blown fuse, TVs or other diode issue or some other problem with the board.

Also note, PS3 is NOT DCS signal polarity sensitive but PS2 is.

Why this matters easily explains why PS3 engine is found on the track but not PS2.

red from the tiu ouput to center rail, black to outer rail.

@Jolodo posted:

I recently converted my subway from the old DCS remote commander to my TIU's second track. I added all of my Proto sound three subways but the TIU cant find my Proto sound 2 subways. It's worth noting that I could find the proto sound 2 subways on my lower track (track 1). Any suggestions on why I'm Having this problem? You guys are always the best Thanks in advance!!

Again simple reversed DCS polarity would cause this issue.

Problem solved! The polarity was reversed.
Thank you all so much for your help. You guys are the best!!