Light Battery Mercedes Class A

Hello friends, I had a load problem in a Mercedes Class A, which after extracting the alternator and replacing the regulator I have partially solved, since it already loads perfectly. The problem is that I cannot turn off the light of the picture I can't get it on .... I have reviewed all the connections, and the load is bore ... if someone can help me.

It could be that if the regulatory box is not the cable that carries the signal the pilot light is not working properly or that this cable has some inperfect.