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A 3 lamp fixture with two series ballasts can be replaced with a 3 lamp parallel ballast. As seen below, connecting the 3 lamp parallel ballast to the three lamps can be a bit confusing. This is because the wire colors on the ballast and the lampholders will not match up.

  1. On the 3 lamp ballast, an individual wire is connected to the lampholder of lamp 2 on the left side, and the common wire on the right side.
  2. The other two individual wires are connected to the lampholders of lamps 1 and 3 on the right side, and the common wires to lamps on the left.

After 3 Lamp Two Seriesl Ballasts are Replaced


How to Replace 3 Lamp Two Series Ballasts with Parallel

1 Lamp and Two Lamp Series Ballasts

Factory wiring

Light Fixtures with Two Ballasts

Fluorescent tube light fixtures with two ballasts are typically wired in the same manner. Individual wires of one ballast connect to the one side of the fixture, individual wires from the other ballast connect to the other side of the fixture. The common wires of each ballast are connected to the other side of the fixture from each of the individual wires.

As seen below on ballast 1, individual wires are connected to the lampholders of lamp 2 on the left side, and the common wires on the right.

On ballast 2, common wires are connected to the lampholders of lamps 1 and 3 on the left side, and the individual wires on the right.

After 3 Lamp Two Series Ballasts is Replaced

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3 Lamp Series Two Ballasts Lampholder Wiring Diagram 1

Replace

Ballasts

Replace 1

Lamp Series Ballast with 2 lamp Parallel

Replace 1 Lamp Series Ballast with 2 Lamp Series

Replace 2

Lamp Parallel Ballast

Replace 2

Lamp Series Ballast with Parallel

Replace 2

Lamp Series Ballast with Parallel 2

Replace 2

Lamp Series Ballast with Series

Replace 3

Lamp Parallel Ballast

Replace 3 Lamp Two Parallel Ballasts with Parallel

Replace 3

Lamp Series Ballast with Parallel

Replace 3 Lamp Two Series Ballasts with Parallel

Replace 3

Lamp Series-Parallel

Ballast with Parallel

Replace 3

Lamp Series-Parallel

Ballast with Parallel 2

Replace 3

Lamp Series-Parallel

Ballast with Series

Replace 4

Lamp Parallel Ballast

Replace 4 Lamp Two Series Ballasts with Parallel

Replace 4

Lamp Series Ballast with Parallel

Direct-Wire Dual-Ended

LED Tube

Lights

Direct-Wire Single-Ended LED Tube

Lights