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Light fixtures from the factory are wired with the ballast wires connected directly to the lampholders. When changing a ballast, it is not feasible to disconnect and reconnect the wires from each lampholder. When done this way, the lampholders need to be removed from the fixture. It is simpler and faster to do the following:
If a ballast is replaced with the exact same type of ballast, the wire colors usually match.
When a 2 lamp magnetic ballast is replaced with a 2 lamp electronic, or if a 3 lamp electronic ballast is replaced with a 4 lamp electronic ballast, wire colors will not match.
When replacing a ballast where the wires colors don’t match, it is important to understand the ballast wiring concept. Just matching colors could cause a problem.
Ballast wire (top) is 18 AWG. Line voltage wire (bottom) is 12 AWG.
Strip wires about 3/8 to ½ inch in length.
Use orange, yellow, or tan wire connector.
Ballast wires are 18 AWG. Use a blue wire connector for up to four 18 AWG wire connections.
Use orange wire connector for more than four 18 AWG wire connections.
or view embedded video below
Wire connector for line voltage wires
Wire connector for ballast to lamp holder connections