Can you post a couple of pics of the back where the power cord is or was or is cut. And how many wires were in the cut plug wire if you happen to know?? Is it a plug in the wall type unit or does it require 12vdc to power it. I can find pics of the front of it, but nothing showing the back of the unit. Speaking of that, is this re unit you have that I am speaking about as so I know I am not chasing stupid mistakes on my own part LOL!! Here is a pic of one I found searching, just a from pic.
Let me know if this is the one and if so, again, can you post up some pics of the back of the unit. And one with the case removed if possible. This will help us to help you. And last but not least, is it plug into wall type unit or is it 12VDC input?
Hope you get it resolved and fixed. Good day. And keep us posted about it!! Again, good day and God Bless.