I picked up 2 of these used along with one of the matching 135 watt bricks and a CAB1. I don't have any TMCC locomotives so this is all in conventional mode. Everything is the same, only variable is swapping the powermasters. I've double checked the switches are in "run" and "conventional".
One works great, super simple to install! The other will not completely power down regardless of what I do. When I roll the CAB1 red wheel the whole way down the volts reduce from 19 to 10. The halt button also just decreases the voltage back to 10v, doesn't kill it. I suspect there is a problem with this one but want to make sure I'm not missing something.