it's for the slide motor. I should cut out the extra and crimp a new connector. It's probably copper!In my Class C there was an extension for the shore power cable coiled up just like that. Check to see if it has plugs on it at both ends. If it's not hooked up you can get rid of it. Sell it to someone who needs it like I did. If it is hooked up to something you may want to trace it out and find out what it goes to. It may be to an option you may want to utilize. They would not put 25' of extra wire there for nothing. It' too expensive. If it's there there will be a reason. I'm curious, let us know what you find.