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2008 Mercury Mariner Base FWD 4dr I4

2008 Mercury Mariner
Trim Info:
Front Wheel Drive, 4 Door, 2WD Sport Utility Vehicles
20 mpg city / 26 mpg hwy
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January 4, 2014, 8:47 pm

Lea H

Question: 2008 mercury Mariner headlight issues but new headlights

I have 2008 Mercury Mariner with Right headlight "out" and when I turn on high beams ALL my lights go out headlights (dual lo/high beams), parking lights etc. I have installed brand new headlights so the lights themselves are not out?

What should I check? Can I fix myself? What wires go to what, diagram, I need help so I can pass my inspection.

January 8, 2014, 6:02 pm

Ron W
Expert Mechanic

Did this happen before or after replacing the headlamps? If it happened after, I'd suspect the bulbs may not be 100% properly installed and you should recheck your work. If it was before, Check you fuses as most modern cars have separate fuses for each headlamp. As to all the lights going out with the high beams activated, that may be a lost ground (which could cause your other issues as well) or possibly a defective switch.

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January 9, 2014, 8:00 am

Lea H

This happened after. How or where can I check the lost ground? I think it is more electrical since bulbs are new and when high beems activated all light (low beams, parking and high beems are OFF). I only have a few more days to get reinspected.

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January 12, 2014, 9:32 am

Ron W
Expert Mechanic

It may be the bulbs that are causing the problem. Receck that they are the correct part number. And make sure they are fully plugged in the connector. That is probably where the issue is.

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January 12, 2014, 10:14 pm

Lea H

bulbs are H13 as recommended. i will check tomorrow. I need an ohms tester i believe or 3 hours of labor to pay a mechanic with lectrical knowledge

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