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There could be several causes, some of which include:
- The fuse [or circuit breaker] which protects the circuit is "blown," thus "opening" the circuit, preventing the flow of electricity.
- The brake light switch is not properly installed, or adjusted properly.
- There is a "bad" electrical connection, anywhere within the brake light circuit. This could include: corrosion inside of one or more of the wiring harness connectors, or corrosion where ground wires are screwed to the body sheet metal [the body sheet metal is grounded to the battery negative terminal, and thus acts to return current flow to the battery].
- One or more of the conductors has been broken or cut, thus "opening" the circuit, just like turning off a switch.
There probably other reasons which do not come to my mind at this point. Good luck.
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∙ 14y ago
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