Chosen Solution
I have an older SM-57 with 3 wires inside yellow, green and black ground. the ground has become disconnected on the side oing into the chassis. where does it connect?? the copper rail inside??
That is the ground wire. It’s not needed, as Shure did away with that wire in newer versions of the SM57. However, I believe on the XLR end it was connected to pin 1 and on the cartridge end it was connected to the center post of the cartridge.
