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3 Lamp Series 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.
After 3 Lamp Ballast is Replaced
After 3 Lamp Ballast is Replaced with a 4 Lamp Parallel