Douglas,
FYI: It may be more advantageous (and cause less clutter) if you included this as an addendum post in your original thread. Folks will sometimes change the title by adding something like "Update" to the original title to indicate that there is new information or news that's different from the original inquiry.
Tom
https://tstage9.wixsite.com/nyc-modeling
Time...It marches on...without ever turning around to see if anyone is even keeping in step.
I would separate the engine from the tender. Take the tender off the tracks then apply power. If you don't get a short you know the problem is in the tender. If it shorts you know the engine has a problem.
Check the tender also by putting it on the track and taking off the engine. Apply power and check for shorts. If no short you know it's in the engine. If it still shorts you've got something assembled wrong in the tender.
Hopefully only one or the other has a short.
Bill
Except that I am apparently wrong, but I appreciate your reply.
That must be it. A bare portion of some transmitting metal is making contact with the frame or the running gear somehow, and it seems to be when you replace the shell (?) I had a problem with a BLI Niagara 4-8-4 that confounded me until I removed the rear truck under the cab. That solved my short. But not the problem. I found that a tensioning spring was making contact with the lead axle...of all things, and that caused the shorting. I had to do some frustrating tweaking over about two hours until I finally figured out I had to smack the rivet that held the tine to which the tension spring was mounted forward. That tightened the whole doin'zes and and my shorts were history. I hope you can track it down. Open your mind and start from one end, top to bottom, and work your way back.
-Crandell
I had this experience with my Trix: I removed the tender six-axle truck cover and the wheel sets for cleaning. I was careful to replace the wheelsets correctly (so I thought), but the engine ran poorly, shorting out frequently. I could not see anything wrong, nor measure anything with my ohmmeter. Finally I saw that one of the wheelsets was installed with the pickup fingers on the wrong side of a wheel. This is very easy to do, and very hard to see.
Hope that helps.
Hal