Brake light question for the electrical guys

As I understand, pressing the brake, one element of the bulb on the drivers side of the car, is lit. Depressing or removing your food, both elements are lit. Sounds like lack of a good ground to the fixture.

Yellow wire = parking lights to right fuse 5 (E')
Red wire = to brake switch and to right side light



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Actually bulbs from both sides are in play since you must use clues from one side to troubleshoot the other side.

The brake bulb red wire connects to left and right sides so both bulbs should light identically when the brake is pressed. If not, bad ground (or bad bulb).

Parking bulbs are also wired together left and right sides but the left one takes a detour, (but no guarantees) to join at the glove box switch (potential source of poor connection) before completing its full journey to the right 5 fuse. With headlight stem twisted, parking lights R & L should illuminate equally.

Common fault as noted before is a bad ground, especially when one bulb gets brighter. IIRC the bulb has brake/parking is one bulb with two elements in it, and with a bad bulb ground, the brake light current passes through the parking light bulb element to get a poor ground and dimly lit bulb.

I.e. when a single element light looses anything it goes out. But when a dual element bulb looses anything, you get odd symptoms. Hence, assuming the bulb is good, check the ground to the fixture.

 

Let me know what you find, since I have the same identical problem!

Ace

 

With a test light take the bulb not working out either jump the terminals on the brake switch or have someone press on the pedal,Check and make sure you have current to the socket on the brake lead,Check for corrosion inside the socket and also check the wires to the socket.Could be as simple as Corrosion.