I ended up getting a mth z4000 the other day. When I run the commodore vanderbuilt Hudson with tmcc on it my rear coupler is opening. I also noticed that my rear back up light on the tender flickers sometimes going over the switch. It does not do either of these two issues while running with the cw-80. Could this be an issue with the transformer or the engine?
What was the outcome of this, asking because I have a Z4000 in mothballs.