Do you have a tilt steering wheel ?? If so then more then likely the wires are shorted out where the wheel tilts. Common problem.
The Vin is located in front of the steering wheel on the dash. where the windshield meets the dash
steering wheel diagram for 1993 silverado horn
Stabilize and secure right front wheel steering mechanism
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Have you checked the steering wheel?
4 wheel drive does not work 1989 chevy half ton pick up silverado
its not the steering stabilizer, i bet its the intermediate steering shaft. they had a lot of problems with that part. feels like someone is banging your steering components around with a broom stick, right?
You may have pressure on the steering wheel locking pin. Try moving the steering wheel one way or the other while trying to turn the ignition key.
ball joints could be bad Did you make sure you got all the air out of the power steering system?
steering wheel in locked positon try moving it a little either way and the key should turn. The steering wheel has a locking device that wont let the key turn if the wheel is not free or you have the Wrong key