My steering wheel rotates back and forthYou can

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

a bad idler arm/pitman arm, You will have a hard time trying to keep the car going straight, it will wander all over the road.

1. Road walking. When the vehicle wanders back and forth in the direction of travel and it is difficult to keep it straight.
2. When sitting still, there is considerable play in the steering wheel. It can be moved considerably with no resistance.
3. When sitting still, and with the front wheels off the ground, it is possible to move the wheels side to side without the steering wheel moving. If there is to much play in the steering wheel or side to side movement of the wheel when the vehicle is stopped could indicate there is a problem with the idler arm.

If all is fine when moving in a straight line - you are probably OK. Turning while in four wheel drive, especially a full hard over turn, puts a great amount of strain on the universal (or CV) joints of the steering axles. Although CV joints are smoother they too still have to supply power to the steering wheels at an angle while turning. If you have concerns about the CV or universal joints, jack up your vehicle, secure it with blocks at the wheels and put on jack stands, then inspect the joints checking for excess play. Rotate the front tires back and forth by hand while watching and feeling for unnatural movement or obvious broken joints. They may be difficult to see if covered with a rubber boot. If you do have boots, they need to be in good shape since they are designed to keep dirt out of the joint. If they are not in good shape, broken or split, they should be replaced. Let me know if this helps. Thanks

raise the truck and have some one rock the steering wheel back and forth while you look for excessive movement at the idler arm - also check is the input shaft on the steering gear box rotating more than the output(pitman arm side) i've seen more steering box failure in the last several years especially true with big tires or boggy road driving, a rebuilt box can be bought at a local parts store- o'reillys, advance, napa etc.

if you hold the steering wheel straight ahead does the car move side to side or does the steering wheel fight you to move side to side.

Could be a couple of things, the pin that locks the steering wheel could be failing to activate.

Try one thing, with vehicle parked, key off, take the steering wheel and rotate it back and forth a bit to see if the wheel locks at that point. I have seen some vehicles require that. (Manufacturer would not call this a problem if it does lock up after rotating the steering wheel.) May have to turn the wheel as much as 1/8 to 1/4 of a turn. (OK, 1/4 a turn is a bit much, but hard to gauge how much rotation you are doing.)

Everyone always gravitates to the suspension but folks, it's 99% sure that it is the EVO. The EVO is the sensor built into the steering column that senses movement of the steering wheel then controls the power steering pump accordingly. When it goes out (which is all too frequently) you get sloppy and loose steering at lower speeds and it does tighten up a bit on the highway at higher speeds. This is the way it is supposed to work but when it fails it's downright scary trying to keep the truck straight on a narrow two lane road!

If your steering wheel is off center, this can cause the problem. Luckily this is very easy to fix -- you can do so even if you have little to no experience working on your vehicle.
1. Park the vehicle with the wheels facing straight ahead (drift forward until you are moving in a straight line). Don't worry about the steering wheel position. 2. Locate the steering drag link -- the diagonal rod coming from the bottom of the steering arm to the top of the passenger side steering knuckle (on the axle near the tire) 3. Loosen the two bolts on the rotating adjustment collar on this link. I believe these are 13mm. 4. Rotate the collar one way about two or three turns, check the steering wheel to ensure that the "Jeep" logo is perfectly horizontal. If it's not, continue rotating the collar (or move it in the opposite direction) until the wheel is centered. 5. Tighten down the nuts on the drag link adjuster. 6. Take her for a test drive and let me know how it worked!

it sounds like you may have loose tie rod ends. which causes the front end to feel like it is floating. look under the front of your car at the steering linkages and have someone gently move the steering wheel back and forth. so you san see what is moving....dont forget wheel chalks!

did you ever let somebody check the wheel allignment, it may be the camber shaft.