Step 2 · Disconnect Old Dishwasher Plumbing and Electrical
With the utilities off, begin disconnecting the old unit. Under the sink, locate the dishwasher's drain hose, which is typically a flexible, ribbed hose connected to a nipple on the garbage disposal or a sink drain wye-fitting. Use a flat-head screwdriver or nut driver to loosen the hose clamp and pull the hose off the nipple. Be prepared for water to spill out. Next, find the water supply line connection at the shut-off valve. Use an adjustable wrench to loosen and disconnect the supply line. Finally, remove the cover plate at the bottom front of the dishwasher to access the electrical junction box. Use a screwdriver to remove the box cover, and a non-contact voltage tester to TRIPLE-CHECK for power. Disconnect the wire nuts holding the black, white, and copper ground wires.