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Wires connected to each side of a non-shunted lampholder can be swapped with the other side of the same lampholder.

In the first example below, notice the wires on the lower right lampholder pins.

In the second example below, the lower right lampholder terminals are swapped. Either wiring configuration will work.

Swap Terminals on Non-Shunted Lampholders

After Swapping Terminals

After Swapping Terminals

Swap Terminals on Non-Shunted Lampholders Diagram

Swap Terminals on Non-Shunted Lampholders Diagrams

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Swap Terminals on Non-Shunted Lampholders