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First you buy a good-quality 3rd brake light kit appropriate for the mounting angle on your particular car -- see the links below for examples. If your car's left and right brake lights are separate from the left and right rear turn signals (different bulbs for the brake lights and turn signals), then you just follow the instructions with the kit. If your car has combination brake/turn lights (the same red light burns steadily for brake light or flashes for turn signal) then you must run a new wire from the brake light switch to the rear of the car to feed the new 3rd brake light -- cars with combination brake/turn lights route power from the brake light switch through the turn signal switch and then from there to the back of the car; if you try to get away without running the new wire, the 3rd brake light won't work properly and you'll backfeed other lighting circuits with random results.
What else can I help you with?
How do you change the center third brake light on a 2003 E320?
Begin by removing the wiring harness from your third brake light. Remove the third brake light retaining screws. Reverse the process to install your new third brake light.
Where is the fuse for the third brake light on a 2001 F-150?
the third brake light is direct from brake light switch no fuse
Third brake light on a 96 Chevy beretta?
how to change third or center brake light on Chevy beretta 95
How do you replace third brake light in 2009 Hyundai sonata?
How to change third brake light in 2009 Hyundai sonata
Who was the third rear brake light named for?
The third brake light is named for then Secretary of Transportation Elizabeth Dole and are called "dole lights".
What year did Chevelle introduce the third brake light?
Chevelles never had a third brake light since the Chevelle name was dropped after 1977. However, third brake lights were first installed (and required) in 1986.
How do you remove a third brake light?
with a hammer
What is a third brake light used for?
A third brake light is used to provide a deceleration warning to vehicles that can't see the left and right lights. You can learn more about these brake lights at the Wikipedia.
Why do your brake lights work but the third brake light does not and not the ABS light is on?
New bulb needed or broken wire
Did a 1989 Chevy truck have a third brake light or just a cargo light?
The 1989 Chevy truck did not come with a third brake light as a standard feature. Instead, it typically had a cargo light above the truck bed. However, some later models and trims may have included a third brake light, but it was not common for that year.
How do you replace the third brake light on a 2005 Mustang convertible?
Crawl in the backseat, remove the screws on each side of the housing, pull off the light replace the bulb and re-install! Good Luck!
When did cadillac introduce the third brake light?
1985
