Remove lower dash panel, under steering wheel, there will be a bracket that holds steering wheel, remove both 15mm nut's that point up, not the 13mm bolt's the screw into the colum , steering wheel will come down enough where you will see the ignition switch on the top side of the colum, the switch will be screw to the colum with the head light dimer switch.
It is mounted on the tube of the steering column near the bottom on top of tube, it is driven by a rod from the ignition lock cylinder.
SOURCE: 1989 Chevy Pick up Ignition switch broken
use a test light the wire from the battery should be hot all the time the wire that goes to the solenoid should be hot when the key is turned over to start and the wire going to the coil should be hot when the key is in run.
SOURCE: how to replace an ignition switch on a 1989 chevy
go to link the year is diff but the procedure is the same. scroll to bottom of page
http://www.2carpros.com/forum/1994-chevy-s-10--ignition-lock-cylinder-vt197051.html
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