I'll start with situation dimmer switch stopped working replaced column in 2004 LS with a used SS model everything worked at install next time i started car steering wheel buttons would not work and airbag light came on hooked orignal column buttons worked once then stopped cant find a bad fuse where do i look next

Most cars have the switch mounted on the column stalk (the turn signal does double duty). Where the switch was easy to replace on old cars (a simple remove and replace), you’ll have to consult a shop manual for info regarding repair of a column-mounted dimmer switch or consult local auto parts store.

You can go on line and get the exploded view of the steering column.

What is year--make--model of vehicle? Right now, I'd say, check the wiring circuit to and from dimmer switch. Could be dimmer switch, itself?

With wiring diagram, you can find proper color wire from steering column to low beam, everything on, see if voltage on that wire. I'm speculating that the dimmer switch controls voltage to low beam and not ground.

Under the dash, find wiring harness that goes into steering column, find proper color wire, test. If no voltage, when there should be, I think the problem is in the steering column, either wiring circuit or dimmer switch.

Could be your dimmer switch gone bad, that controls your low and high beams, the contacts for the low beam is usually the one that goes bad first, the high beam contact isn't used much.
My Oldsmobile had the same problem, only high beams worked, replace the dimmer switch and fixed the problem. Unfortunately with my car replacing the dimmer switch gave me a hard time. Most dimmer switches are located in the steering column underneath the dash board and a little hard to get at. Dimmer switch costs about 12 to 15 dollars, very cheap but very hard to reach and replace. The switch it self is activated with a small metal rod going up and down next to the steering column and into your turn signal lever, when you pull up it pushes the metal rod down to activate your high or low beam lights.

Do you have a interior light dimmer/switch next to the head light switch? rotate it until interior light comes on,then back just enough to them off. Now turn on headlights; Can You see me now? Hope thats IT, Good Luck

see this steps and fix it use the VOM or DVOM. God bless you
The Cause: Most likely no voltage to the headlights because of a bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring fault.
To figure out what's causing your problem, start by inspecting the main fuse for the headlight circuit. See your Owners Manual for the location of this fuse. It is often located in the power center in the engine compartment, but may also be in the fuse panel under the dash.
If the fuse has blown, replace it with a new fuse (same amp rating) and try again. If the fuse blows immediately, there is a short in the headlight circuit that will have to be found and repaired before the headlights will work. If the fuse does not blow and the headlights work, problem solved (for now). There may be in intermittent short or overload that caused the fuse to fail.
If the fuse if okay, use a volt meter or 12-volt test light to check for power at the fuse. Most headlight circuits are on (powered) all the time, so there should be voltage to the power side of the fuse. No power at the fuse would indicate a wiring fault possibly in the fuse block or in the wiring between the fuse block and the battery. You'll need a wiring diagram to trace the wiring circuit and find the fault.
If the fuse is okay and there is power, the next check would be to find the headlight relay or control module. If the system uses a relay, pull it out and shake it. If anything inside rattles, replace the relay. Or buy another relay and plug that in to see if that restores power to the headlights.
On systems that use a module control module or daytime running lamps, about all you can do is eliminate other possibilities such as wiring faults, a bad relay or headlight switch first. If the module is getting power when the headlight switch is turned on, but the headlights fail to come on, the problem is likely a bad module. The module may be located in the front area of the engine compartment (common on Fords), under the dash or elsewhere in the front of the vehicle. You will probably need to refer to the vehicle service literature to find the module's location.
If the headlight relay or module do not receive voltage when the headlight switch is turned on, a bad switch is your problem. Switches get a lot of wear and tear, so it's not unusual for a switch to wear out after many years of service. Replacing a headlight switch can be difficult depending on whether is it located in the instrument panel or on the steering column.
If your headlights work on low beam, but you have no high beam, or they work on high beam but there is no low beam, the most likely cause is a bad dimmer switch. The dimmer switch is integrated into the steering column mounted headlight switch on most vehicles, so if the dimmer is not working, you will have to replace the entire switch.
DO NOT attempt to replace a steering column mounted headlight switch without first disconnecting the battery and waiting at least 20 minutes for the capacitors in the airbag circuit to discharge. The steering wheel will have to come off to replace the switch. Crossing up the wrong wires in the steering column could set off the air bag and cause personal injury.
If a headlight switch looks like it will be difficult to replace, don't try to do it yourself. Take your car to a dealer or repair shop and have them replace the switch for you.

your dimmer switch is mounted on the left side of the column & ignition switch is mounted on top of the steering, you could have a short in this area, there is a rod that goes from the lever to the dimmer switch, look for bare wires, remove the trim below the column, remove the clip for the shifter indicator & remove the 2 bolts holding the column up, this will give better view of the switches & wires.

There is a gray colored wire on the back of the pivot pulse dimmer switch assembly that is most likely the culprit. Not the multi function turn signal/wiper/cruise lever, its the wires that go through the column down to the plug just under the dash at the column. You may be able to see these wires using a flashlight looking into the opening behind the turn signal lever pulling the lever like your dimming the lights may help to see this. The wire may be just hanging there. Very common failure due to the fact that these wires move every time you dim your headlamps. You will have to replace the "Pivot pulse dimmer switch assembly". in the steering column. This switch assembly is attached directly to the turn signal switch. Disabling the air bags and removing the steering wheel will be required. If you decide to do this yourself, I would strongly suggest getting a good service manual and following the procedure to the letter.

Try tapping on the motor itself while it is switched to high. It is most likely the brushes may be stuck. Through time it will wear out and eventually need to be replaced.

This Outlines Removal Of Both LOCK CYLINDER<< Mechanical)) And The Ignition SWITCH ITSELF<< ELECTRICAL))

1. Remove steering wheel as outlined previously.
2. Remove turn signal switch as outlined in ``Turn Signal Switch, Replace'' procedure.
3. Place ignition switch in ``Run'' position, then remove lock cylinder retaining screw and lock cylinder.
4. To install, rotate lock cylinder to stop, while holding housing as shown, Fig. 6. Align cylinder key with keyway in housing, then push lock cylinder assembly into housing until fully seated.
5. Install lock cylinder retaining screw. Torque screw to 40 inch lbs. for standard columns, or 22 inch lbs. for adjustable columns.
6. Install buzzer switch, turn signal switch and steering wheel

CABALLERO, EL CAMINO, C, K, R, V & 1986---87 G MODELS
The ignition switch is mounted on top of the mast jacket inside the brake pedal support and is actuated by a rod and rack assembly.

1. Disconnect battery ground cable.
2. Disconnect and lower steering column. On some models, it may be necessary to remove the upper column mounting bracket if it hinders servicing of switch. Use extreme care when lowering steering column to prevent damage to column assembly. Only lower steering column a sufficient distance to perform ignition switch service.
3. On Caballero and El Camino, rotate ignition lock to ``Off'' unlocked position.
4. On C, K, R and V models, rotate ignition lock to ``Off'' locked position.
5. If lock cylinder has been removed, pull switch actuator rod up to stop, then pushrod down to second (Caballero or El Camino) or first (C, K, R and V models) detent as shown, Fig. 7.
6. Remove column mounted dimmer switch, if equipped, then remove switch retaining screws and switch.
7. Reverse procedure to install, noting the following:

1. Place gear shift lever in neutral.
2. Place lock cylinder and switch in positions noted in steps 3 and 4.
3. Fit actuator rod into hole in switch slider and secure switch with retaining screws, ensuring switch does not move out of detent.
4. Install and adjust dimmer switch, if equipped, as outlined in ``Column Mounted Dimmer Switch, Replace'' procedure.
5. Torque retaining screws to 35 inch lbs., then check switch operation.