"Tell us more about these blinking signs (model # or supplier?). If by upper range you mean these buildings require 11V or whatever to operate, then it seems you need at least 2 independently controllable voltages...that is, one that can be lowered to 8V for buildings that don't blink, another that must stay up around 11V for buildings that do blink."
These are select Railking buildings that include blinking signs wired to the same hook-up terminal as the structure's lights - they do have an off/on switch. I found that the signs need at least 10-11 volts to blink - whereas the building lights come on around 7-8 volts.
In testing my current building set-up I discovered one 11-story building had no lights above floor 4 - been spending all morning disassembling and diagnosing - turned out to be a loose or bad plug that went bad at some point - frustrating to say the least.
