If FPPTs suggestions don't work, the replacement plugs you have may be a poor remake of the original. Another item for you consideration is TinMan3Rail's switch power connectors. https://www.tinman3rail.com/?p...old-style-bootstraps
These plugs not only provide fixed power to switch mechanism, but it also provides track power via the little spring contact that pushes to the side and off the pin. I have used these with great success on our layout.