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Help...no headlights and it's dark outside

I have a Mitsubishi Montero an the other day my headlights would not turn off. I shut the engine off, then they went out. Now they will not turn on. I checked all the fuses and one relay but I found that I am not getting any voltage to the fuse. I took the switch apart and couldn’t find any thing wrong with it. Any thoughts?

Year of vehicle?

Did you physically use a multi-meter, pull and test the fuses and relay to confirm they are good?

If not, pull them, spray electrical contact cleaner in the fuse/relay holders and test for power. Dirt and light corrosion will break the contact.