Headlights on in bright sunlight

Asked by Aug 06, 2015 at 05:40 PM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

With automatic headlight control on, headlights always on. Off position turns them off.

4 Answers

50

Replace the sensor

1 of 1 people found this helpful.
109,715

Yep sounds like the sensor is no good....

1 of 1 people found this helpful.

Unless you have a dash cover-protector covering the 'eye' sensor. Then it 'thinks' it's always dark

1 of 1 people found this helpful.
70,325

Unplug the sensor and connect the two wires in the plug together, for testing purposes, with a short jumper wire. If the headlights now stay off in the "auto" setting, the sensor is bad. Low resistance across the sensor is light, so the headlights will be off, high resistance across the sensor is darkness, so the headlights will be on. HTH. -Jim

1 of 1 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,742 nationwide Grand Marquis listings starting at $1,950.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,730
  • #2
    kbro
    Reputation
    2,130
  • #3
    Js08016
    Reputation
    1,870
View All

Related Models For Sale

Used Lincoln Town Car
34 Great Deals out of 1,774 listings starting at $1,500
Used Ford Crown Victoria
4 Great Deals out of 1,174 listings starting at $1,496
Used Chevrolet Impala
514 Great Deals out of 34,084 listings starting at $950
Used Ford F-150
2,289 Great Deals out of 184,004 listings starting at $699
Used Chevrolet Tahoe
667 Great Deals out of 39,529 listings starting at $1,000
Used Ford Mustang
689 Great Deals out of 37,936 listings starting at $895
Used Honda Accord
1,087 Great Deals out of 61,514 listings starting at $1,099
Used Ford Taurus
250 Great Deals out of 16,389 listings starting at $1,850
Used Toyota Camry
1,026 Great Deals out of 73,436 listings starting at $295
Used Chevrolet Camaro
411 Great Deals out of 30,759 listings starting at $3,550

Used Cars For Sale

2010 Mercury Grand Marquis LS For Sale
5 Great Deals out of 99 listings starting at $3,490
2009 Mercury Grand Marquis LS For Sale
7 Great Deals out of 78 listings starting at $2,950
2008 Mercury Grand Marquis LS For Sale
6 Great Deals out of 99 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.