My garbage disposal is busted and my wife wanted to be rid of it anyways. It's hard-wired and, after some trial and error, I found it is on the same circuit as a GFCI above the sink. (Not the same circuit as the dishwasher).
AFAIK I have two options here regarding the GD romex:
1) Use wire nuts, electrical tape, and a blank electrical box to cap the live wires. Probably nail it into the kitchen cabinet. That would allow a future homeowner to wire a new GD if they wanted.
2) Pull the GFCI outlet and see if the GD romex is just extending off the GFCI. If so, remove and pull the romex completely out.
Advice? I'm a relatively novice DIYer, I've capped a few blank boxes but I don't want to make my house's wiring even more funhouse than it is.
Best Answer
Your best and safest path forward would be to purchase an old work box and a blank cover. Instal the old work box in the wall with the wiring inside the box. Nailing a box to the cabinet would violate code in many locations as the romex must be protected under the sink.
Old work boxes are inexpensive and made for jobs like this. With the wires safely capped inside the covered box is the least expensive way to do this and the circuit can be used in the future if needed.