if your speaker reads open you need a new 8 or 16 ohm speaker probably has a 50 MM speaker inside tender ! mth sell them or asc techs also have them ! typically they used a 16 ohm in the ps 2 5 volt boards ! item number is probably 20-3048-1 or similar
BF-0000033 | MTH ELECTRIC TRAINS (mthtrains.com)
BF-0000022 | MTH ELECTRIC TRAINS (mthtrains.com)
Alan