How to Wire a Dishwasher Pump

A dishwasher pump is an essential part of the dishwasher because it supplies water to the device. Wiring the pump is a risky job, but with the correct preparations and skills, the task is pretty easy. If you are doing this for the first time, you may want to ask for professional assistance.  

Tools and Materials

  • Circuit Breaker
  • Wire Strippers
  • Wire Cutter
  • Wire Nuts
  • Screwdriver
  • 2-wire Cable with Ground

Step 1 – Turn Off the Power and Water Supply

Assuming that the dishwasher is already mounted into its cabinet under the sink, turn off the power supply and the water supply. When working with electrical circuits, make sure to wear safety equipment such as gloves and goggles at all times.

Step 2 – Prepare the Circuit Breaker

The dishwasher should have a dedicated wiring system or circuit. This means that it should have its own circuit breaker installed in the breaker panel. Purchase a 20 amp or 15 amp circuit breaker. Open the breaker panel to expose the circuit breakers. If the breaker panel cover has screws, use a screwdriver to remove the screws. Find a vacant slot in the breaker panel in which to install the circuit breaker.

Step 3 – Run the Cables

Run a 2-wire cable with ground from the panel to the location of the dishwasher pump. Do not connect the cable to the circuit breaker yet. To connect the cable to a pump, drill a 1½-inch hole at the bottom back of the cabinet where the dishwasher is installed. Use the recommended circuit conduit to cover the cables. Check local codes for more details.

Insert the cable into the hole and locate the wiring harness in the dishwasher. To connect the cable to the wiring harness, remove 2 inches from the cable sheathing t expose the wires: one black, one white and one bare copper wire. Strip ½-inch of installation from all black and white wires both on the cable and on the wiring harness. Connect black wires together using a wire nut. Connect the white wires together with a wire nut as well. Hook both bare copper wires to a ground screw in the harness. Tuck the wires inside the harness carefully. Make sure that no bare wires are exposed.

Step 4 – Connect the Cable to the Circuit Breaker

Before inserting the circuit breaker into the breaker panel slot, mark it with dishwasher or any reminder as to what it is connected to. Remove 6 inches of cable sheathing to expose the wires. Strip 1 inch of wire insulation on both black and white wires. Insert the cable into a knockout at the side of the breaker panel. Clamp the cable tightly.

Hook the black wire to the screw on the circuit breaker. Hook the bare wire to the grounding bus bar. Hook the white wire to the neutral bus bar. Snap the breaker in place and tuck the wires inside the panel. Put the cover back on. Tighten the screws. Turn on the main power supply and water supply. Test the pump.