car will not start on 1992 Cadillac DeVille

when attempting to start my car it will make several rapid clicking noises. after this all power is lost to the vehicle. when i touch the negitive battery cable wih my wrench the power is restored but not enough to start my car

Asked by for the 1992 Cadillac DeVille
This sounds like a battery connection problem. Remove the battery cables, clean them and reconnect them, make sure they are tight and the wiring is not damaged.
Let us know if that helps!