Skip the auto shop - Our mechanics make house calls

Q: Trouble with exterior lights - 2010 Mercury Milan

asked by on

I’m having trouble with the exterior lights. There are 3 total fuses for my car: high beams, low left beam, and low right beam. The low beam fuses, in the manual, are #7 & #8; high beam: #17. The #7 fuse is not there and my headlights are not working. I replaced the driver side bulb, which had been broken in an accident, but before doing that, the passenger bulb (which had been intact and working), then stopped turning on. When I turn the switch on past the parking light selection the parking lights go out, however the headlights do not turn on. Since the #7 fuse was not originally there and was not the cause since it previously worked, is it needed -- and also, why won’t the lights turn on?

A: Hello, thanks for writing in. It sounds lik...

Hello, thanks for writing in. It sounds like you will need to replace both bulbs and all three fuses. The price of bulbs and fuses is so cheap most of the time, that the amount of time to test each component and inspect for errors, is usually not worth it. Driver safety and properly functioning headlights are very critical and we never recommend operating the vehicle at night without them 100% functional. Replacing all the fuses (and yes, absolutely replace #7) and bulbs should solve the issue. If the problem continues, you will want to start checking the power supply and then the switch. This can be done with a multi-meter. If you’d like to have this checked for you, a certified professional from YourMechanic can come to your home or office to diagnose your headlight issue and make the correct repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car will not start when I turn the key, it just makes a clicking sound. What is wrong?

A starter like any other mechanical and electrical part is subject to failing sometimes for no apparent reason. However, sometimes this is misdiagnosed as well and often times mistaken for something much more simple like a fuse, relay, or starter...

Q: Car will not crank or turnover

Check for continuity in the fuse block that is adjacent to the positive battery terminal. The block will sometimes corrode (due to its proximity to the battery) causing a no start condition. The blocks are replaceable as a unit. Once...

Q: How to remove the climate control switch assembly?

Hi there. The switch cluster is located within the dash in a combination with the radio. The surrounding plastic case that holds the switch in place is held in by plastic tabs. Gently pop out the plastic tabs from the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.