How to Replace 1 Lamp Rapid Start Ballast with 2 Lamp Rapid Start

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

1 Lamp Rapid Start Ballast Diagram

Factory wiring

1 Lamp Rapid Start Ballast Replaced with 2 Lamp Rapid Start Ballast Diagram

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.

1 Lamp Series Ballast Lampholder Diagram