"O.B." wrote in message
...
We have a 4-lamp magnetic ballast that is on the blink. The ballast is a
Mark
III Energy Saver made by Advance Transformer, catalog number
R-4S40-A-TP-AC.

This ballast is a magnetic ballast and costs $60 to replace. I can be a
4-lamp
electronic ballast from Lowe's for $30.

Is it possible to swap the bad magnetic ballast with an electronic
ballast? If
so, are there any modifications that I need to make to the 4' fixture?

Just know how to read a wiring diagram and follow the instructions......