I got an 05 mercury montego from a used car dealership as is (I’m not upset about it just need to know) the passenger side headlight will turn on for 5-10 seconds and then turn off. Any advice or know what’s wrong?
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Did you check the bulb? The filament might be broken and making intermittent contact. I would replace both bulbs as a starting point anyway. Old halogen bulbs don’t put out as much light as new ones. If that doesn’t fix the problem, check the headlight connector for corrosion and fit. Also look for any wear on that wiring harness.