Just bought a MTH GP-30 Premier (20-2276-1) at an auction. Engines runs smoothly with great diesel sounds and smokes like a steam engine...but......No lights, No horn and No bell.
Changed battery to a standard 9V for testing purposes and no improvement. Also tried a new BCR. All connections appear to be secure. Any "diagnosis" as to what the problem my be???
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Conventional or command? I'm assuming conventional, that could be as simple as the transformer, or it might be the board isn't recognizing the DC offsets.
Assuming conventional, did you try a "Factory Reset" using the Horn and Bell buttons on the transformer. The button sequence can be tricky so here's a video showing it. Of course since your Horn is not working you won't hear the single Horn sound when you first press the Horn button (followed by 5 Bell buttons) as in the video. If this reset clears the problem, you should hear the double-Horn acknowledgement.
Thanks for the responses!!!
"Bingo" Stan. I did the factory reset like you illustrated above and all is well. Lights on, horn and bell now operational. I run my MTH motive power conventionally with a MTH Z4000. My Lionel motive power I run command TMCC.
Don't know why I didn't consider a reset...must be that septuagenarian focus "thing"
Lights on, horn and bell now operational. 
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