Question about 1991 Mercury Cougar

1 Answer

I have a 1991 Mercury Cougar LS. Intermittently the left brake light will fail to work. The right one works, as does all the rest of the lights,: reverse, park, turn signal, etc, even when the brake

Intermittent left brake light failure. All other lights on that side as well as right side continue to work

Posted by on

  • Lisa Eyten Oct 25, 2012

    Sorry, I forgot to mention that it has a new bulb as well as a new socket -- that was the first thing that we thought of. We also checked wiring and connections as well as grounds

  • yadayada
    yadayada Oct 25, 2012

    I said to check grounds as wll as connectors or did you even read that?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Mercury Master
  • 79,186 Answers

Replace the bulb first, if it still does this replace the socket and make sure the ground for the light is clean and tight and that the connectors for the tail lights are fully clipped together.

Posted on Oct 25, 2012


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 5 Answers

SOURCE: 1999 Mercury Cougar Lights not working

did you check the relays under the hood?

Posted on Oct 13, 2008

  • 114 Answers

SOURCE: turn signals and hazard light stop working inside and out of car,

Try this easy check. Press the hazard switch on and off about 20-30 times and see is it all starts working again. The contacs in the switch assembly get dirty and this will help clean them up from non use. Worth a try.

Posted on Mar 22, 2009

  • 6927 Answers

SOURCE: 2001 Mercury Cougar turn signal light bulb

3057 bulb

Posted on Jul 09, 2009

  • 881 Answers

SOURCE: brake lights stay on even after car lights etc

THE stop light switch is either in the brake line somewhere under the bonnet or above the brake pedal
Its either a pressure or a finger switch.....

Posted on Oct 08, 2009

  • 79186 Answers

SOURCE: 1991 mercury cougar V6 3.8 liter

yes u have a defective flasher relay.

Posted on Oct 20, 2009

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Brake light and blinker are in the same bulb All new bulbs

Bulb burned out the brake and running light use one wire blinking uses another wire

Jun 12, 2015 | Mercury Cars & Trucks

1 Answer

How do I fix opera light on an 1989 mercury cougar ls?

they are a problem I would learn to live without

Feb 25, 2015 | 1989 Mercury Cougar

1 Answer

No brake lights 91 mercury cougar

probably a brake light fuse

Feb 01, 2013 | 1991 Mercury Cougar

1 Answer

Mercury cougar 1995 push hazard light switch lights work

Faulty hazard switch or signal switch are on the same part.

Oct 31, 2012 | 1995 Mercury Cougar

2 Answers

Location of all fuse boxes on a 1991 mercury cougar LS

fuse box is located under hood behind battery

Nov 27, 2011 | 1991 Mercury Cougar

2 Answers

Brake lights not working

There is a Relay under the Hood in the Fuse Relay Box. Replace this and it should be OK. If not let me know so that we can look elsewhere for the Problem. Please Rate my Solution, I need all the Help that I can Get!

Jan 26, 2009 | 1999 Mercury Cougar

2 Answers

1991 cougar XR7 speedometer off odometer not working

Can you fix this my headlight blink off and on and i must hold high beam light switch on blinker handle to drive at night

Dec 17, 2008 | 1991 Mercury Cougar

2 Answers

1999 brake light do not work

perhaps there is a relay in the engine compartment.

Oct 26, 2008 | 1999 Mercury Cougar

1 Answer

1999 Mercury Cougar Lights not working

did you check the relays under the hood?

Oct 08, 2008 | 1999 Mercury Cougar

Not finding what you are looking for?
1991 Mercury Cougar Logo

133 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts


Level 3 Expert

79186 Answers


Level 3 Expert

5681 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides