1988 ford thunderbird brake lights and turn signals not working

Question edited for clarity and add maker.
Question moved to model category.

https://www.fixya.com/cars/t15449384-fuse_box_diagram_ford_thunderbird_turbo

https://www.google.com/search?q=1988+ford+thunderbird+fuse+box+diagram

Also look for a big fuse molded into the positive battery lead. Some have them, some don't.
..

Lets start at the beginning.
The turn signals and brake lights use different fuses but both go thru the turn signal switch and use the same bulbs.
Have you checked the fuses for each circuit and does each switch have power in and out ?

Turn signal tail lights and BRAKE LIGHTS NOT WORKING

It can be faulty brake light switch causing the problem or its blown brake light bulb. First check and confirm brake light lamp is working and that's not the case.

For turn signal not working it can be faulty turn signal switch or its issue with wiring:----

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To trouble shoot brake and turn signal related problem, check the help links mentioned below:-----

Click the link:----
1996 Buick Regal Grand Sport Brake light Switch Location? http://schematicsdiagram.blogspot.in/2012/04/1996-buick-regal-gran-sport-brake-light.html

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No brake lights on Buick? http://schematicsdiagram.blogspot.in/2012/04/no-brake-lights-on-buick.html

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Brake lights not working on 1989 BUICK REGAL?

http://schematicsdiagram.blogspot.in/2012/04/brake-lights-not-working-on-1989-buick.html

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How to replace Brake light switch on Chevrolet Tahoe?

http://technoanswers.blogspot.in/2012/02/how-to-replace-brake-light-switch-on.html

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How to replace Parking, turn, and Brake Lights on car?

http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html

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Upper brake lights work, but low brake light not working?

http://schematicsdiagram.blogspot.com/2011/12/upper-brake-lights-workbut-low.html

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1997 Cadillac Catera: How to replace Brake Light Switch?

http://howtobyme.blogspot.in/2012/06/1997-cadillac-catera-how-to-replace.html

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2003 Chevrolet S10 Tail light Fuse http://schematicsdiagram.blogspot.com/2012/11/2003-chevrolet-s10-tail-light-fuse.html

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Chevrolet Parking light and Tail lamp light Wiring diagram http://schematicsdiagram.blogspot.com/2012/11/chevrolet-parking-light-and-tail-lamp.html

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Car Tail Lights Not Working?

http://schematicsdiagram.blogspot.com/2011/12/car-tail-lights-not-working.html

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Turn Signal Not working http://technoanswers.blogspot.com/2012/11/turn-signal-not-working.html

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Right turn signal not working on Pontiac Car?

http://schematicsdiagram.blogspot.com/2011/12/right-turn-signal-not-working-on.html

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Only one side indicator light working on car?

http://schematicsdiagram.blogspot.com/2011/12/only-one-side-indicator-light-working.html

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Turn signals not working on 1987 Jeep Wagoneer? http://schematicsdiagram.blogspot.com/2011/12/turn-signals-not-working-on-1987-jeep.html

1996 Chrysler LHS brake light circuit wiring diagram?

http://technoanswers.blogspot.in/2012/02/1996-chrysler-lhs-brake-light-circuit.html

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How to replace rear Brake lights on 2004 Toyota RAV4? http://schematicsdiagram.blogspot.in/2012/02/how-to-replace-rear-brake-lights-on.html

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One brake light on driver side not working, but other lights work?

http://schematicsdiagram.blogspot.com/2011/12/one-brake-light-on-driver-side-not.html

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2002 Lincoln Town car Fuse Box http://schematicsdiagram.blogspot.com/2012/11/2002-lincoln-town-car-fuse-box.html 2007 KIA Rio: Brake Light Fuse Box Diagram?

http://repairhelpcenter.blogspot.in/2012/06/2007-kia-rio-brake-light-fuse-box.html

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Overhead Brake lights not working on 1999 GMC Sierra 4x4?

http://technoanswers.blogspot.in/2012/03/overhead-brake-lights-not-working-on.html

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2004 Ford Mustang: Brake light Fuse Location?

http://howtobyme.blogspot.in/2012/05/2004-ford-mustang-brake-light-fuse.html

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These will help.

Thanks.

1988 Ford Thunderbird Car Stereo Wiring Diagram

Source: http://www.modifiedlife.com/1988-ford-thunderbird-car-stereo-wiring-diagram/

Sounds like the same problem I had. It turned out to be a bad "Head light switch" If it turns out that it is a bad fuse, type in the word Ford fuse box, and it will show you all the fuse box diagrams you'll need in order to find the correct fuse.

If the lights come on but just do not flash, replace the flasher relay. Your Thunderbird has 2 flasher relays. One for the Turn signals and one for the Hazard lights. The turn signal relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in lower corner of fuse block . The hazard relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in rear of fuse block. Replace the one for the Turn Signals. Information Curtorsey Auto Zone.

Check the brake light switch located under the dash, connected at the junction where the master cylinder rod connects to the brake pedal. Remove the connector and with a short piece of wire, paper clip works fine, insert into the two terminals on the connector. Check to see if your brake lights are on. If they are, your switch is bad.

you could have a bad ground. you will need a test light and probe each light till you find one that does not work

Check your brake light switch. If your car has cruse control, set it at a safe speed and step lightly on the brake pedal and release. If it doesnt disengage then brake light switch is bad.

oh yes,, believe me you have just enter the pits of hell..
i have a 1990 thunderbird and your lights and **** are all right there with the stereo wiring my dash lights went out and it took forever to figure out how to get them back on good-luck ray
if you need me just holler