SW wiring

[stuartmit]

Have an sw but no instruction sheet. If combination bu gives 19v is that fixed?Is AU19 volt variable?  Similar for cu and du but 14 volts?

And u posts linked internally so that only one of them needs a wire to another transformer for coordinating use after polarity match?

 

[TrainLarry]

A-U is 19 volts variable.

B-U is 19 volts fixed.

C-U is 14 volts fixed.

D-U is 19 volts variable.

 

Larry