I disconnected the controller and opened it up. All seems to be in order inside, i.e., not bare wires touching anything they shouldn't.
I then touched the appropriate binding posts with a piece of wire and got the same chattering.
As much as I hate to remove the turnout, it's going to have to be done. It has to be something inside that can only be accessed to from below, ugh !
I dismantled the RH switch as it's not mounted to the table yet. It's very simple inside, but I can see where it would be possible for one of the wires to have been compromised and maybe touching one of the bus bars. Unlikely but possible.
The only other thing I can think of would be the PCB in the motor housing. Perhaps something went wrong in there. There are two black flat head screws that hold the motor cover in place. I discovered them accidentally when I had the RH switch open.
More experimentation today perhaps.
I purchased these second hand but new, so I doubt that I can send them to Lionel for any kind of warranty service.
