Hello everyone. I am new here. I stumbled in to this site :signs101:while I was researching for an answer to a customer's phone question. They have a sign cabinet with 6 - 5 foot lamps and one ballast and only 3 of the 6 lamps light. The lamps were replaced by the owner and they still don't light up. I have not been out to the sign but wanted some knowledge before I roll up. Any thoughts to what to look for in a diagnosis? Thanks!