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After 3 Lamp Ballast is Replaced Option 1

3 Lamp Series to Parallel Lampholder Wiring Diagram

The lampholders on the left side of lamp 2 and 3 need to be disconnected from each other and rewired as individual wires for the new parallel ballast as shown above. The lampholder on the right side of lamp 3 will be wired from Individual to common and connected to the lamp 1 and 2 right side common wires.

How to Remove Wires from Fluorescent Lampholders

Pull Wire from Lampholder 1Pull Wire from Lampholder 2

In the left image, the wire is wrapped around the fingers of the dominant hand as shown. In the right image the dominant hand is closed, while grasping the lampholder in the other hand. The wire is gently pulled while twisting the dominant hand until the wire comes out.

Remove Wires from Fluorescent Lampholders Video











See page 2 for wiring options 2 and 3.

3 Lamp Series-Parallel Ballast Lampholder Wiring Diagram

Replace 3 Lamp Series Ballast with Parallel Wiring Diagrams

How to Replace 3 Lamp Series Ballast with Parallel

A 3 lamp series ballast can not be replaced with a parallel ballast without rewiring at least two lampholders. As you can see in the “factory wiring” diagram below, the left side of lamp 1 and the right side of lamp 3 have individual wires. The right side of lamps 1 and 2, and the left side of lamps 2 and 3 have common wires. This is typical series parallel wiring.

There are three options for replacing a 3 lamp series ballast with parallel. The first is shown below in option 1. Option 2 and 3 are shown on page 2 of this article.

Factory wiring

Replace Ballasts

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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