The shop was to busy to look at my charging system so I went and got it. I removed the two long screws and pulled the back off the generator. The brushes were very dirty lots of what appeared to be carbon, I took emery cloth and cleaned the thing that the brushes ride on, then I cleaned the large cylinder with the cloth. The "field " that is the thing inside of the generator case was dirty also with black soot or something, I cleaned that as well. I scrapped all the black paint like stuff off that. I hope I did not hurt anything as this is the first time I have been inside of a generator. The brushes and springs were ok as they moved freely and I cleaned the contact area with the emery cloth as well. My question is did I mess up anything or miss anything? When it comes to the two studs "field" and "Arm" the plastic at the base of these studs was a bit brittle should I be concerned about that? I'm I ready to put this generator back on my car now? any thoughts ?