Brake light

[DP CA NJ]

The brake light will always stay on. 
it some times fades out and with some rapid flashing. Then it will go back on.  

[Mikesmalaga72]

Check out all your tail light wiring, shorts, bulb connections, and grounds. Verify the brake light switch for functionality/adjustment and its connections at brake booster bracket.

Clean and assure the body grounds are bonded properly and all wire terminals are clean.

Assure fuses are rotated in their holders to remove oxidation.   

[Mike Self]

Check your brake light switch (small screw-in switch atop the bracket that holds the power brake booster.  The switch can be adjusted with a threaded body and a lock nut.  Make sure the button is fully compressed with the brakes released, otherwise the brake lights will be on all the time, and melt your tail light lenses.   Check for current flow there when the brakes are off.  There shouldn't be any.  Those switches are "normally on" switches (the button is held in until the brakes are applied,, and then extends to complete the circuit) and can develop corrosion on the internal contacts, causing weird problems.  Use a small screwdriver to push in the button and let it snap out several times.  That usually knocks off the corrosion.  

 

You may have a brake light wire in one of the tail lights either connected to the turn signal terminal, or somehow touching, permitting feedback from the two circuits.

 

mike

 

 

[Dave919]

Another plus one on the switch.  Mine was really gummed up last year and returned to service with a good cleaning (I bought a spare just in case before driving to MidAmerica)

[John76]

A fourth ++++ for the switch.

The brake light switch is powered by fuse #5 on the later cars. The only thing that would keep the light on is a sticky/faulty switch.

See the brake light wiring on my wiper diagram. Obviously, the fuse is good, and the bulbs are getting power, and they would not come on if the grounds were bad.

As @Mike Self cautioned, check the bulbs for the proper wattage to prevent a melted lens. 10W bulbs in the taillight sockets.  The turn signal, back-up and brake lights are 21W.

John