RR_MelMy DCC controller is a MRC Prodigy Advance² 15-16 volts @ 3.5 amps.
Is that the manufacturer's spec or did you measure it somewhere on the layout?
Have you ever checked to see how much voltage the MRC puts on the rails? This can be tricky to measure completely accurately without a specific DCC meter, but a multimeter set to AC volts should give you a rough idea if you are getting what you should from the booster.
Layout Design GalleryLayout Design Special Interest Group
Please define "no power".
I'm beginning to realize that aging is not for wimps.