Dash mounted reverse light

When I got my 70 Dart (4-speed) the dash mounted reverse light didn't work. It turned out the wire from it wasn't plugged in anywhere under the dash. I never bothered at the time to figure out where it went but I would like to finally get it working. It isn't cut and has the connector on the end of it so if someone could tell me where the wire plugs into I would appreciate it.