Lights don’t dim with more electrical devices on?

Connections are all good. Just installed an MSD Ignition too and I’ve double checked those wires too. Grounds have all been cleaned checked and re installed. Now to think of it I did install a new voltage regulator from the parts store last week. Factory one seemed fine just looked rough and I’m on a mission to clean up the engine bay. I’m gonna try putting the factory one back in and see what happens.