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You need to check the wires in the steering column. Take the column cover off, probably phillips-head screws, so you can see the wires. Somewhere the tilting function is putting pressure on the wires to the dimmer switch. It may be pulling loose a connection, just a fraction, to lose contact. You may also need a new dimmer switch. Or a multifunction switch if the dimmer switch is attached that way. The headlight switch is on the dash, isn't it? If it is, the headlight switch is not the problem, it is the wires in the steering column or the dimmer switch. If the dimmer switch fails, you will have no high or low beams, no head lights at all.
I don't believe there is a fuse. There is a circuit breaker built into the headlight switch. If you are sure the headlight switch is good, it could be a bad dimmer switch. If you have a voltmeter, with the headlight switch turned on, a larger yellow wire going from the headlight switch to the dimmer switch should be a hot wire. The dimmer switch sends power on a tan wire to the low beams, and through a light green wire to the high beam bulbs.
If your high beam indicator on the dash also doesn't work, then it is likely one of those switches. A voltmeter or test light would need to be used to find which one is bad. If you can find the connector at the steering column going to the dimmer switch, pull it apart and check for power on the yellow wire coming from the headlight switch, with the headlight switch turned on. If no power, the headlight switch is bad. If there is power there, then the dimmer switch must be bad.
The headlight switch gets power for the headlights from a 50amp fuse. The fuse powers the headlight switch then the dimmer switch breaks for high and low beams. So if the high beams work, the problem may be with the dimmer switch. The dimmer switch is made into the turn signal switch on the column. You would need to check the low and high beam circuits at the switch for power.
Replace the dimmer switch and check for burned wires, melted insulation on wires, wires fused together from heat, etc. When the new switch is on, check operation thoroughly before putting the steering column back together. If the headlight switch is also on the column, check it too.
You need to take the vehicle back to whoever repaired it for there's a rod running down from your dimmer switch to the actual dimmer switch mounted above your ankles which should be white and/or green and it has two 5/16" nuts or 8 mm, same thing, and the headlight dimmer switch is slotted to move it up or down the column to make contact. You can do this yourself in loosening the bolts, turning on the headlights, and when they stay on, lock down one of the 8 mm bolts, then check the dimming feature and if it's still not correct, loosen the bolts just enough to move the switch (with the rod coming down from the steering wheel) just enough to "fine-tune" your adjustment.
I’m inclined to believe you have a headlight switch problem and here’s why. There are 2 fuses one for each of the headlights on the vehicle. For the daytime running lights (DRL) to operate the fuse and wiring to the right head light has to be good, because it supplies the power for both headlights in the DRL mode. The fuse and wiring for the left headlight has to be good because the DRL relay needs power from that fuse to operate. The DRL relay in turn provides a path through the left headlight and wiring to ground. When you pull back on the dimmer switch, you are activating the flash to pass circuit of the headlight switch assembly. Because the flash to pass mode works you then know that the high beam wiring and headlight bulbs are in good condition. This also tells you that the ground circuit for the headlight switch is good. In many newer vehicles, the headlight switch doesn't provide power to the lights. The headlight switch has now become the path to ground to complete the circuit. The headlight switch and the high/low beam dimmer control are one assembly so when you replace one you get the other free. Such a deal! My coffee bet is on the headlight switch assembly.
Skinny, I think your on the right track. Disconnect one of your low beam head lights, turn the headlights on and to low beam, you should have voltage on the "tan"wire at the headlight. If you do not, go to the dimmer switch under the steering column and check the same wire. If it still has no voltage, replace the dimmer switch.
Good luck and let me know.
Everything relating to do with the wiring is in the steering column, if someone has cut the wires going into the column and taped them back together in order to pull the steering column out for service the wiring needs to be replaced. the good news is if that is your problem it will cost you no more that about 30 dollars to fix it, the bad news is you have to pull the column to replace it. I hope that shines some light on it for you.