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Brake Lights Don't Work


There could be several causes for this problem, and without being able to see and troubleshoot the brake light wiring circuit no one can tell you the specific cause.

Some of the possible causes include:

  • Brake light switch is not adjusted properly.
  • The fuse for that circuit is "blown" out.
  • A wiring harness connector anywhere in that circuit has become unplugged, or loose.
  • The ground wire or wires for that circuit have become disconnected, or the connection of the ground wires to the vehicle's grounded body sheet metal has been blocked by corrosion.
  • A wire in the circuit has been cut, broken, or pulled loose.
  • The brake light switch has become defective.


There are probably a few other causes that I have forgotten about.

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Wiki User

15y ago

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