Def a Well made sign! Plug it in and listen (make sure radio is off) in a quiet room where the sign is. Worst that could happen is it'll trip your circuit breaker. If bulbs try to light up that's a good sign. laugh Give the bulbs a 1/4 turn in both directions. Maybe remove them as well and check for corrosion...steel wool any muck. Poke around and see how it's wired and to how many ballasts, etc. Narrow down the problems by figuring out which bulbs, ballasts (starters?) need to be replaced. Most ballasts tell you on a label what it's supposed to be lighting. Wondering if they used HO (high Output) bulbs for this sign for colder weather locations. If 2-prongs at the end of each bulb NOT HO's, If 2 prongs surrounded by a black oblong boot...then they're HO's.

DOC @ THE AMERICAN GARAGE