74 duster crank at relay. Wont turn over :(
You've got the one-year-only seatbelt interlock system.
Go under the hood, somewhere on the firewall (I forget exactly where it is) you'll find a box that looks like this:

Hit the red reset button.
If that doesn't do it, then you've got issues. As said, get the FSM and start tracing wires following the power.
Oh, and buckle your seatbelt before you crank it over.