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If your garbage disposal unit doesn't have its own electrical circuits, you can still try another route. Tie your garbage disposal unit into the electrical circuits for the dishwasher.
1. You'll need a single pole switch to operate your garbage disposal unit.
2. Tie neutral white wires together with a wire nut.
3. Tie bare ground wires together with a wire nut.
4. Each of the two black wires attaches to a terminal on the single pole switch. Attach the incoming wire to the bottom terminal. Attach the outgoing wire to the top terminal.