Fuse or dimmer switch is the only answer i can think of if lights come on but just won't go from high to low or visa versa
Your high beams work but your low beams do not because the switch is broken that switches between high and low beams. Electrical switches wear out.
As a guess both low beams are burnt out The daytime running and high beams are the same light filament. Or the fuse or the relay for the low beams.
If low beams do not work and the high beams of a Mitsubishi Eclipse do, it is probably due to a corroded connector. Simply clean the connector and add some petroleum jelly to the terminals.
Bad dimmer switch.
Bad bulbs?Bad Hi-low switch?
Bulbs are burnt. replace both. low and high are together in the same bulb.
Headlights have two filaments; one for low beams and one for high beams. There is a good chance that the low beams are burnt out. This doesn't necessarily mean that the high beams won't work. However, it's not too common for both low beams to burn out at the same time. Of course, it could be a fluke. I would replace the headlights with new ones and then go from there.
Check bulbs Check hi-low switch
check all the wires that ground coming from the headlight
I'm not sure what you mean by that. Usually low beams have its own coil, high beams have its own. They work on separate cirtcuits.
First check the bulbs, if the bulbs are good I would suspect the high/low beam switch is bad.
low beam fuse blown.