1986 gmc sierra no power at ignition - 1986 GMC K1500

SOURCE: 1997 GMC Sierra Truck Ignition Switch

its a long process,you need a steering wheel puller, once its off take the hazard button assembly out, take the turn signal loose, pull old ignition out, carefully install new one, and reverse procedure and always if u get confused i would highly recomend
a chiltons manual they explain things great

SOURCE: 1997 GMC Sierra Ignition Switch Replacement

take off the cover on the top and bottom of the steering column just behind the wheel. pop the tilt lever out simply just by grabbing it and give it a good tug. then once you have the new switch and you get in there your going to need an inverted torx socket to remove the small bolts that hold the switch to the column. do not move the gear on the new switch make sure it lines up exactly as the old one did!!!!!!!!!!!!

SOURCE: When I try to start my 1986 GMC Classic Sierra 1500 the starter..

Yes your problem because you have changed the starter then you have 6 bad 1/2 worn teeth on the FLYwheel and the only way to fix your problem is to either remove the engine OR gear box and remove the flywheel and have a new starter ring fitted to flywheel and refit what was removed and away you go finished ...
THEother way to start every time till you do it is to HAND brake off put in 1st gear and turn engine over 1/2 a turn ,and then it will start every time, as the engine will stop the same place every time so thats were the 6 worn teeth are. Have a goodday
Let me know hoe you get on Ron
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SOURCE: looking for ignition switch in 93 gmc sierra

Tword the bottom of the steering colume. It will have a couple of connectors going to it and a couple of rods going to it from the igniton cylinder. IT is on top and not easy to get the bolts out of it. You will need to remove the close out pannel to even be able to see it.

SOURCE: 1986 GMC K1500 HEATER ONE SPEED

Check this site http://www.autozone.com/autozone/repairinfo/common/repairInfoMain.jsp?targetPage=productsHowToInspect&leftNavPage=productsHowTo&pageId=%090900c15280213ef6&subtitle=testout it will help you with your problem