House Calls: August 2009
![House Calls: August 2009](https://familyrvingmag.com/wp-content/uploads/2009/08/water_pump_circuit.jpg)
To add a third water pump switch to a circuit, the new one must be a four-way switch inserted between the three-way switches. The common, center terminal of a three-way switch will be colored differently from the other two terminals on the same switch. A four-way switch does not have a common terminal but instead has color-matched pairs of terminals.
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