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How to Replace 3 Lamp Series Ballast with Parallel

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3 Lamp Series Ballast

Factory wiring

3 Lamp Series Lampholder Wiring Diagram

3 Lamp Parallel Ballast Wiring Diagram

Replacement ballast

3 Lamp Parallel Ballast Wiring Diagram

3 Individual wires, 1 common wire

A 3 lamp series magnetic ballast should be replaced with a 3 or 4 lamp parallel electronic ballast. Each lampholder has four separate connections.

  1. Connect each of the individual blue wires from the parallel ballast to each pair of the lampholder individual wires (red, blue and blue-white).
  2. Connect the common red wire from the parallel ballast to the yellow pair of lampholder common wires.
  3. When replacing with a 4 lamp ballast, cap the third individual blue wire with a small wire connector.

After 3 Lamp Ballast is Replaced

3 Lamp Series To 3 Lamp Parallel Lampholder Wiring Diagram

After 3 Lamp Ballast is Replaced with a 4 Lamp Parallel

3 Lamp Series To 4 Lamp Parallel Lampholder Wiring Diagram