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First of all, there is no wire that runs from the horn to the steering column (if the horn circuits had been properly diagnosed you would know this). I would recommend diagnosing and repairing the horn circuit the correct way rather than butchering your wiring harnesses and adding more problems to the electrical problems that you are already experiencing.
If you would like help with diagnosing and repairing your truck's horn circuit, I would be happy to help you do that.
Remove lower instrument panel trim panel. Remove two steering column to dash and brake support bracket nuts and lower the steering column. Remove the two ignition switch to column screws and lift the switch off of the lock rod. Remove the black harness connector first and then remove the white harness connector.
Remove turn signal switch. It is not necessary to completely remove the turn signal switch from the column. Pull switch rearward enough to slip it over the end of the shaft. Do not pull the harness out of the column.
Remove attaching screw and lock cylinder set. Do not drop the screw into the column.
To install, align cylinder key with keyway in housing, as shown in Fig. 1. Push the lock completely inward, install attaching screw and torque to 40 inch lbs., on standard columns, or 22 inch lbs., on tilt columns.
This solution more than likely will require internal steering column inspection.First make sure the entire steering column is not loose.If you can move the steering wheel w/column from side to side or up and down more than 1/2 inch it's loose.Sometimes the key will engage while wiggling the steering column.There are 3 torx bolts deep inside the column that need tightening.Second,the Ignition key cylinder may be bad and need replacing
Underneath the dash, follow the steering column and you'll find a square longer-type switch with an electrical connector on one side and a rod coming out of the end of it going towards the dash. It's held on by 2 quarter inch (or smaller) bolts. Remove the connector, remove the two screws, and slide the switch out of the rod. Install reverse of removal.
Yes, it will fit.Years that fit are 89 to 94.Appearance may be different it steering wheel between a chev or gmc,but wiring should be a exact fit.Other differences in columns are column shift(auto)w/tilt or w/out tilt wheel or floor shift(standard)w/tilt or w/out.