4 Lamp Two Series Ballasts
After 4 Lamp Two Series Ballasts is Replaced
A 4 lamp fixture with two series ballasts can be replaced with a 4 lamp parallel ballast. As seen below, connecting the 4 lamp parallel ballast to the four lamps can be a bit confusing. This is because the wire colors on the ballast and the lampholders do not match up on two of the connections.
Replace 4 Lamp Two Series Ballasts with Parallel