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How to Replace 1 Lamp Series Ballast with 2 lamp Parallel

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

1 Lamp Rapid Start Ballast

Factory wiring

Replacement 2 Lamp Instant Start Ballast Wiring

2 Individual wires, 1 common wire

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

1 Lamp Series to 2 Lamp Parallel Lampholder Wiring Diagram

Ballast wire colors can vary depending on the type of ballast or country of origin. Below are the same diagrams with different wire colors. The ballast from this example is from a desk lamp.

Factory wiring

1 Lamp Series Ballast 2

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

1 Lamp Series to 2 Lamp Parallel Lampholder Wiring Diagram 2
1 Lamp Series Ballast Lampholder Diagram 2 Lamp Parallel Wiring Diagram