Quoted from drjeff112:
I read through this thread and im not sure about adding in the external power supply for the Color DMD. That looks complicated and the Color DMD by itself worked fine for months and I think adding in the new topper which also runs off the same circuit was just one too many mods and that blew the fuse.
they are simple to wire up, get a switching power supply and a lamp cord. wire the lamp cord to the "L" (line) and "N" ( neutral) on the PS you will have +12, +5, GRND, maybe -12. use the +12 , +5 and grnd for your dmd and the +12 and grnd for the topper, plug the lamp cord into the service plug in the cab. easy peasy.