recurverider posted:after deleting the engines I tried start up with the one on the track it didn't do any sounds but It did go forward but that's all.
This confused me a bit (it's not hard to do!).
So the engine(s) re-added to the remote OK? Then you pressed start-up? Then the engine moves silently?
I'd really suggest that you get a 4 wire handset cord and plug it directly into the TIU. It won't work without any antenna I believe?
When you try fix #2 I would disconnect the outputs of fixed #1 if you didn't. The fact that you say one side doesn't work spells problems to me.
I really think you need to take this TIU to a local MTH store for testing. It sounds like the TIU isn't putting out proper signal.