I have a 243W Whistle Tender. My track power is a ZW. Whistle works fine when I push the whistle button. But when I put the tender on the track, alone, no engine, and apply track power, the whistle relay hums / buzzes. ( not loud, but it hums )
I also have a 2046W and a 2466WX Tenders. Their whistle work fine, no hum.
Any thoughts ?
Steve