Question about 1991 GMC Sierra
The ignition switch is located on the top of the steering column underneath the dash.
1. Remove the cover panel from under the steering column and you should see the bracket that holds up the steering column, but before you un-bolt the bracket to lower the steering column, you must remove the clip holding the shifter position indicator cable to the column. (put the shifter into drive and you should be able to see the screw that holds the shift indicator cable adjusting clip to the steering column)
2. Remove the bracket holding up the steering column and carefully let the steering column down as far as it will go, the steering wheel will probably be resting on the seat.
3. You should now be able to see the ignition switch on the top of the steering column, and the two mounting bolts. The high beam switch might share the upper ignition switch bolt, and you will then need to remove the high beam switch before you can remove the ignition switch.
4. Remove the ignition switch mounting bolts (usually 5/16 but I have also seen 11/32 and 3/8 size bolt heads used)
5. Remove the ignition switch by lifting straight up from the column to dis-engage the interlink rod from the ignition tumbler assembly, you should then be able to pull the ignition over towards you just enough to dis-connect the two wire connectors to the switch and then you can remove the old switch from the vehicle. (the interlink rod is sticking straight up from the steering column and it slides up and down with the operation of the key, it fits into a notch in the ignition switch and that is what actuates the switch)
6. Reverse procedure to install new switch, starting with re-connecting the wire connectors and be sure that the interlink rod goes into the notch in the ignition switch.
7. When the switch has been re-installed and is ready to be adjusted, turn the ignition switch to the "ON" position and hold the key in that position and slide the ignition switch up and down until it is in the on position and your dash lights come on, tighten up the ignition switch mounting bolts and then test the operation of the switch, and re-adjust if necessary until the switch operates properly.
8. Adjust the high beam switch by pulling back on the high beam lever and just taking up the slack in the actuator rod to the high beam switch, test the operation of the high beam switch and re-adjust if necessary.
9. When the steering column is bolted back up, re-attach and adjust the shifter position indicator by placing the shifter in neutral and slide the adjusting cable clip until the shift indicator is pointing in the neutral position, test the function of the shift indicator and adjust as necessary.
Posted on Apr 24, 2010
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Posted on Jan 02, 2017
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