Looks like that is what happened. Plugging black to black and white to white seems simple enough. If I was setting this up originally I would put different ends on the 12v and 120v so they couldn’t be plugged in wrong. I looked back through the videos and I didn’t see any concerns about plugging in the 12v to 120v.
I guess I have burned something up. Now I have power back to the refrigerator, but it doesn’t do anything. I hear some clicking when I turn it on, but it doesn’t start. It doesn’t display AC or gas. I can smell gas like it starts to run but doesn’t spark.