The switch is broken. You need to replace it.
It sounds like the low beam/high beam switch is bad. Fuses are not the problem since they are built into the headlight switch and would cause headlights to blink or not come on for both high and low beam headlights.
Well, assuming that you are talking about headlights, the low beams are the dimmest settings for the drive headlights, while high beams are the brightest setting.
Flash your high beams once or twice quickly
are my low beams supposed be come on also when my high beams are on in my 1994 gmc sierra
High beams are the "bright" setting of your headlights. The reason they are sometimes referred to as "high beams" is because when they are on high beam or bright setting, the lights are directed straight out, instead of a bit more downwards as they are on "low beam" or "dim".
there are two diff types of bulbs. High beam and low beam bulbs. If your low beam doesn't work then you need to replace those lights because they are probably blown.
A blown fuse can affect just your high beam headlights. The high beam and low beam headlights are on separate fuses. The separate fuses ensure that you will not lose all of your license at the same time.
the bulbs in your car have two filaments, high beam and low beam. as you generally use mainly low beam the filament wears out a lot quicker than high beam. so replace your bulbs, as it couldn't be anything else.
the high beams work off of a different fuse , both low beams are on the same fuse. fuse panel under dash on drivers side
Using low beam headlights and front facing fog lights.
you will need to get the wiring diagram and follow the schematics,but I believe the high beams generate their power from the mult-function switch
If you are asking about the high beam headlights you either have burned out bulbs or the switch that turns the high beams on has failed. If you are asking about the high beam indicator on the dash I would also think it no longer works account it has failed.