cut wire ?

74 dart sport. so i bought this car, the fuse block and seal belt interlock box hanging down , i look under the dash to see whats going on and there is this red wire just disconnected. not sure cant locate it in the manual schematics. so i go ahead and pull the gauge panel to see whats going on . for the life of me cant see where it goes. anyone ? its the red wire with black tape on the end . I taped it as its hot with the key off