Telefunken tw 562 mystery wire

[rob Cashin]

i picked up a telefunken tw 562 a couple days ago. i rescued it from becoming part of the land fill. it is in great condition, but someone has butchered the wires years ago. i plugged it in, and got nothing. the positive and negative wires are wired to the plug, but theres a grey wire thats cut and i dont know if thats the issue. heres a picture, maybe someone can point me in the right direction?