@Peter C posted:Thanks @stan2004 for coaching me with testing continuity! With a randomly selected Ohms/Continuity range, the meter reads 1. when not connected to anything and .000 when the probes are touched to each other or to the fixed input 2 connections.
Do these readings indicate a short inside my TIU, possibly from a failed TVS? And could a defective Lionel 180 watt powerhouse cause the failure of the TVS inside my TIU?
Those readings indicate a short.
If the breaker did not trip correctly, the PowerHouse most certainly could have supplied too much current for too long and cooked something inside the TIU.
That said, in a case like this it’s pretty hard to determine what was at fault over the Internet.
I can’t think of a scenario where a TIU could “kill” a modern transformer though.
