Question What is the first thing you should try if your headlights fail? Answers Try the dimmer switch. Put on your emergency flashers. Turn the headlight switch on and off. Explanation If your headlights fail, first try the dimmer switch. This will often turn them on again. Pass your DMV Written Test with flying colors Take me to the cheat sheet Maine This questions appears in the following tests: Maine Practice Test 52 Maine Practice Test 34