One brake light on driver side not working,but other lights work?

If all other lights works and also other two brake lights work,then its problem with brake light bulb or wiring.Test the non working brake light bulb in working brake light bulb.If it works,that means problem is wiring and not the bulb.
You should do is run a new ground wire to the light fixture. If only one light is not working and the others do, run a new ground from the battery to the non working light. UN-insulate a small section of the black wire and wrap your test ground on that, then try the light. Also check the connection of the existing ground - it may be corroded and that will cause excessive resistance, keeping the light from working. Hope this helps.Thanks.

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This detailed diagrams will help you.
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CAR LIGHTS REPLACE AND REPAIRS related help,the list is mentioned below:---

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