TIU Too Few?

I believe the simplest solution is a small wall wart power supply from Radio Shack to power your TIU thru its small power jack.  You may need to bring it into the store to match the plug size,  I can't recall the voltage/amperage requirement, but I'm sure that someone else will comment.

Bob

A 12 to 18 volt AC or DC supply with at least 1.5 amps will power the TIU.  Personally, I've used old Laptop power supplies, I've found several in my junkbox that have the right plug.  You can also use a Z500/750/1000 brick if you have one, they have the correct size barrel jack.

That was also going to be my suggestion, as the other posters have said. I use a Z500 from an MTH set for the aux power to my TIU.

From another thread.   Radio Shack Enercell wall wart.

Another source of power for the TIU's Aux. Power port is the Radio Shack "#273-331 "Enercell™ Switchable 18/24VAC 1 AMP Power Adapter with #273-344 Enercell™ Adaptaplug™ M. It should be used (only) on the 18 volt setting.

Thanks everyone! I know I have an extra MTH brick laying around. Correct me if I am wrong: First, disconnect power supply to TIU. Plug in brick to TIU and power up brick. All done?

Paul, with the 120-volt power to the layout off, plug the wallwart or brick output into the AUX port.  Reason I say have the 120 off is to avoid any surges; I wouldn't expect any, but who knows for certain?

Paul,

Thanks everyone! I know I have an extra MTH brick laying around. Correct me if I am wrong: First, disconnect power supply to TIU. Plug in brick to TIU and power up brick. All done?

You still need an input into Fixed #1 to operate trains on that channel. All the brick does is power the TIU itself.

Barry, the two fixed inputs and the two variable inputs are wired already. The two fixed from #1 Z4000 and the two variable inputs from #2 Z4000. You helped me set up the two variables to act as fixed.