1994 Sierra C/K 1500. Ignition gets stuck in on, and wont turn to another position. Engine runs, but many accessories do not work, and can't shift gears. Pushing and playing with the key can eventually get it to work again. It will work fine, and then do it again at some random time interval. It has also done it with two different keys. Is it the ignition switch, or the lock cyclinder maybe?

SOURCE: brake lights wont turn on.1994 gmc sierra.

This may sound too simple, but first verify that you are getting voltage to the light socket. Use meter on d.c. If you are getting voltage, and your bulb is good, it could be a bad ground. Don't overlook the brake light system goes through the directional signal in the steering column.

SOURCE: ignition stuck

sounds like key tumbler broken internally , disconnect coil to stop engine and disconnect battery to stop battery drain til problem fixed, may have to jiggle key and tumbler til it releases key ,

SOURCE: Ignition switch

The Switch is bolted about half way down the steering column on the top I believe. You will have to remove the plastic cover beneath the steering wheel to get to it. Unplug wiring connector from the switch and remove two bolts holding it to the steering column there is a long rod coming from the cylinder lock that hooks into switch, it should come right out after bolts are removed. It will help if you are a contortionist and have very small fingers :)

SOURCE: Ignition Lock Cylinder wont turn

you will need the tumbler replaced. It will not work one day soon at at all

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SOURCE: key is stuck in the ignition

charge the bat