2012 ford edge

Radio? I don't know 'bout that...and why you say it. But a 2012 should be fixed by the dealer, and without the run-around you are getting. They say they find nothing? Keep looking. Go to another dealer if practical where you are. And if by chance you are in California and bought it new, there are strict lemon laws that they will have to give you another vehicle alltogether, depending on how long you have had it. Take the winch cable off..disappear it-- so they can't blame that and void warranty, and make a polite fuss. Say the words lemon law and see how they react. Whatever State you are in, some have it, some do but not as good.

Your vehicle clearly has parasitic draw when it’s off. Every vehicle has this for the radio memory, seat memory, and other options. Some vehicles have more parasitic draw then others what needs to be done is a voltage drop test to see how much draw there is and then figure out what module or modules are not going to sleep like they should. I’m a Hyundai master tech and we had a lot of issues with the radios eating to much when the car was off. If the battery is ok and alternator is charging above 13.5v when vehicle is running then you’re good there. Chances are it’s a module not going to sleep. Only other way to figure it out that is going to take a while is pull the fuse for a system each night and see if the car is dead in the morning with super good luck you may find the module that’s eating to much power.