I am starting to install a painless wiring kit and while going through parts that came off I came up on a box that I have no clue what it goes to. All I remember is it was under the dash.
Seatbelt/starter interlock system. It's a '74-some early 75 only thing. AKA "The Yellow Box" http://1bad6t.com/Maverick/repair/seatbelt_74.html
Thanks for the replies and info. The new wires don't come with anything for seatbelt buzzers(actually says it in manual) so I won't have to worry about hooking it up.
Most of the seat sensors for those got disconnected back in the day. If you set a bag of groceries on the passenger seat, the car wouldn't start until you took the weight back off of the seat. Very short-lived thing.