The mark viii headlights on the 93-96 model years suffer from a condition where the plastic in the headlight lenses cloud up over time usually replacement is the only option
What's dim? If it's the headlights, they have to be compounded out and then polished.
The most likely reason a low beam would be dim is that someone touched the bulb when installing it OR there is a leak in the headlamp body that allows moisture to collect inside the housing the bulb has gotten wet.
Usually dim headlights are caused by a poor ground connection.
the courteous time to dim your headlights is as soon as you see another vehicle, or within one half mile.
when there are oncoming cars, it is appropriate to dim your headlights when they are about 300ft away. Check your diver manual for the most correct answer.
Your headlights may not dim because you don't have dimmer lights. Dimmer lights can blow and leave you with just the high beams.
You should dim your headlights within 500 feet of the car in front of you. The rule of thumb is, if you can see another car, dim your lights.
If you can see the area lit by their headlights, then you are probably close enough to dim your own.
If by "dim headlights" you mean low-beams... the bulbs are bad and must be replaced.
The headlights on the 2002 Toyota Tacoma might work on dim but not on high beam because of a blown fuse. If the headlights are too dim to see properly in the dark, there could also be a problem with the alternator and the charging system in the vehicle.
100 feet
never