Haed lights low beam works switch to high beam spot lights work power at all 4 lights but no high beam. high beam indicator light on dash works

the switch supplies power to the relays that switch on the lights according to the position you have it at
so on high beam there will be 2 high beam lights working
on low beam there will be 2 low beam lights working
back to passing lights or flashing head lights , both beams will work so the switch is the last item to consider
Now with only one side beam not working it comes back to the ground on that light for that bulb
remember that electricity follows the path of least resistance so it the ground is bad the current will ground out through another point including a light which will switch that light off or make it not work
remember the brakes light that flask when an indicator is used --same thing

Well the high and low beam lamps use the same fuses, and the dimmer switch handles the ground circuit. So I would check the dimmer switch if both high beam bulbs are ok.

Year make and model, and have you checked for power at the dimmer switch on each circuit ?

It sounds like you are confused about how your headlamp system is supposed to work. The DRL does not run on the High beam circuit, it runs on the low beam circuit. The fog lamps are supposed operate with the park lamps and also with the low beams, not the high beams. From your description, I would say that your system is operating as designed and you are having trouble telling High from Low. (Don't feel bad, that is why high beam indicators were invented in the first place.)

do you hear the click of the dimmer switch when you move the lever if you do then the steel rod that goes from the lever to the switch itself is working and the switch is moving from the low beam to high beam circuit.if the blue dash indicator is on them power is coming out of the switch to the dash to operate the light.its possible that the dimmer switch may need to be adjusted a little if you don`t hear the click but moves enough to put the dash light on but not enough to turn the high beams on,that is possibly why the low lights stay on.or you have a bad dimmer switch itself

Your switch must be working since your indicator is telling you when the high beams are on, so my guess is that your bulbs are faulty. The high beam part. They probably burnt out one at a time, so you didn't notice until the second one went. Change your bulbs, and see if that solves it. If not, let me know.

Sounds like a bad switch to me. If it was a relay,it would not work period.Not to mention, the switch controls the dash lights too.

MY HIGH BEAM LIGHT IN DASH DOES NOT WORK JEEP tJ