No sound from tender

If I remember correctly, the tender just has an opening for a speaker but no speaker is installed since it's in the engine. The tether has four wires only. Two for the backup light and two for the rear Proto-Coupler. The only way this would differ is if someone had modified the engine to have two speakers and ran a separate tether to the tender.

Thanks for your hint, mountain 482.  It made me take another look at the tether to the tender.  It's actually a five wire connection.  Red/black to the speaker, green/white to the backup light, and yellow to the coupler with a ground from the coupler to the tender floor.  So that makes me think that the issue is with something inside of the engine.

That would be unusual for MTH to include a speaker in the main unit and a second in the tender. They typically just have one per engine whether it be in the main unit or tender. Perhaps this engine is an anomaly to that or someone modified it and put a second speaker in the engine itself and disabled the tender speaker.

That's certainly a non-standard hookup, I've never seen MTH do something like that.  I've never seen a 5-wire tether on an MTH item either.

The product listing on MTH’s website no longer lists the features, but Graham’s Trains does. There’s no mention of a sound-equipped tender.

https://www.grahamstrains.com/...with-ProtoSound.html

With each response, I have to wonder about the production of this particular engine.  It came to me in it's original box, was NOS, and the speaker installation in the tender, along with the tether, certainly appears to be factory installed.  It might have been a prototype and MTH decided to go with only the engine speaker on production runs.  That could be why the tender speaker is not programmed.  Your guess is as good as mine.