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How to Replace 1 Lamp Series Ballast with 2 Lamp Series

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A 1 lamp series ballast can be hard to find, but it can be replaced with a 2 lamp series ballast. Here is how a 2 lamp ballast is wired to a 1 lamp fixture.

1 Lamp Rapid Start Ballast

Factory wiring

1 Lamp Series Ballast Lampholder Diagram

After 1 Lamp Rapid Start Ballast is Replaced with a 2 Lamp Rapid Start Ballast

1Lamp Series to 2 Lamp Series Lampholder Wiring Diagram

The ballast blue wires connect to one end of the lamp, the red wires connect to the other side. The common yellow wires are capped with small wire connectors.