I had the exact same problem with my 60w magsafe 2 charger… it maintained battery level but wouldnt charge, and the Indicator diode was always off. I just had succes heating the aluminum housing at the end of the cord with a hairdryer for a couple of minutes and then beating the end of the the cord into a hard surface with one medium hard hit. Now it works like out of the box. Tried only heating it firstly but for me it was the beating that did the job.