1994 Cadillac SLS Engine will not crank over

If it is not cranking, has the battery connections and battery itself been checked? There is a connector at the front of the rear bank cam cover that has the starter signal wire. You can disconnect and feed power on the starter side of the purple wire to see if the starter engages. If it does, check the harness side with a test light to ground, when ignition is in crank to see if there is a signal on that wire.