This is just a simple demonstration of the clip indicator by SimpleTronics working. It worked so well, in fact, I decided to build one into this convenient project box. You just plug it into your cigarette lighting in your car (as I'm a car audio tech) and plug the white wire to your s+ and thats it. There is an extension cable I made to reach around the entire car.

Heres the original video. All credit goes to him:

https://www.youtube.com/watch?v=L9sVY_wdDKw