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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.
Replace 1 Lamp Series Ballast with 2 Lamp Series Wiring Diagrams
After 1 Lamp Series Ballast is Replaced with a 2 Lamp Series Ballast
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.
Replace 2 Lamp Parallel Ballast
Replace 3 Lamp Parallel Ballast
Replace 4 Lamp Parallel Ballast
Replace 2 Lamp Series with Parallel Ballast
Replace 2 Lamp Series with Parallel Ballast 2
Replace 1 Lamp Series with 2 Lamp Parallel Ballast
Replace Two 2 Lamp Series with Parallel Ballast
Replace 3 Lamp Series Ballast with Parallel
Replace 4 Lamp Series with Parallel Ballast
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