In need of some help. Have HO train layout,A few of the switchs run on 16 volt AC coils. I have A 24 volt ac power supply to operate 24 volt AC relays need to cut voltage to 16 volts for switchs while keeping 24 volts for relays on same circut. I'm thinking A reistor on the coil side but dodn't know what kind. Redbird731@verizon.net