Switch on left side of steering wheel with p on it comes on and shows off.

Something down the steering column from Your dimmer switch harness is interfering with the harness....Follow the steering shaft from the floor board up the column while turning the steering wheel back and forth.....A fire hazard exist if not corrected

Here is a long shot chance. Many cars & trucks, particularly GM, which most all use the same steering column, can have the key lock in the switch and will not come out.
This has been a problem for many, many years. ( 30 + )
Try this: Using your left hand and holding the steering wheel on the far left side, try to force the steering wheel up or down, kinda hard, but not super hard. You could also turn it right and left slowly and with some muscle. Sometimes, all of a sudden,the key will come out if you use the other hand to try to wiggle it back and forth.
Be blessed.

There is a steering arm joining the two front wheels, if the tie rod ends have come loose it may result in only one wheel turning.

Hum...Try this.

With you left hand on the steering wheel and your right hand on the key, turn the key slightly until you feel resistance. Keep the pressure used to turn the key and pull the steering wheel to the left like you are turning left. If this doesn't work then turn the steering wheel to the right while trying to turn the key. If the problem is caused by the steering wheel lock this should allow you to turn the key and starrt your car. It is a very common issue and shows up alot when cars are parked with the wheels turned somewhat to one side or the other.

This is a how-to from VWVortex.com

You WILL need the following,
10MM wrench
13MM wrench and socket or another wrench.
a eyeglasses phillips head screwdriver. (very small)
a regular size phillips head screwdriver
new ignition switch
vice grips (may not need them)
Instructions.
1. lock the steering wheel, and make note where it was just incase.
2. disconnect the battery with 10mm wrench.
3. remove the plastic around/behind the steering wheel by the two screws underneath using a phillips head screw driver.
4. now go under the dash, and remove the plastic peices covering up the steering wheel axel. and unscrew the bolt using a 13MM wrench&socket. Its a "U" joint.
5. Unplug everything behind the wheel including the ignition and the airbag.
6. using a vice grip, or your fingers if it is loose, to unscrew a gold bolt on the left side of the steering wheel column, its right behind the steering wheel on left underside.
7. Gently pull out the steering wheel, and the whole thing, including the axel, and steering wheel will comeout, be careful the end of it is greasy.
8. now with a small screwdriver (phillips), eyeglasses size is what i used, remove the screw where the ignition switch is, its a pretty long screw so it may take some time and it the switch wont come out until its fully unscrewed.
9. replace everything opposite of how it was took out.
Note- when your putting the steering wheel axel back, be sure to put back the large spring and align the axel correctly.

You may look or feel the back side of the steering wheel, looking for 2 screws that hold the airbag to the wheel, these will be internal torq type screws (star) you may have to rotate the steering wheel 90 degrees to access the screws. You should first disable the airbag, by removing the airbag fuse, and or by disconnecting a yellow connector located near the base of the steering column. under the knee bolster.(panel below column). Once the retaining screws are removed, lift bag and disconnect the 2 connector to the airbag, the ground for the horn, and the horn contact wire, which requires you to push down and twist counter clockwise, damage to the horn contact ring will occur if you try and just pull connector from the ring. Now you can remove the steering wheel, may require a puller, and the you will have access to the turn signal switch.

is the steering wheel hard over to the left or to the right ??? if so turn wheel hard so you can move the ignition switch...if thats NOT the case there is a lever that some cars come with on the left side of steering colum that you have to puch down so you can turn key back to original posistion to remove....

Here's a video that will show you where it is and how to replace it.">

your steering switch probly burnt internally, that is the thing that the turn signal and wiper switch is attched too, the steering wheel needs ot be removed to replace it.