Re: i have no brake lights. it is not the fuse.what could...
It could be as simple as bad taillamp bulbs, a poor ground or a failed brakelight switch. The brake light switch is usually under the brake pedal. If this doesn't fix it you have either a failed relay or an open in the line (circuit).
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Buy a cheap multimeter and measure your voltage at the bulb when the brake lights are supposed to be on. You should have 12vdc. Is your 3rd brake light and brake lights on the same fuse? If not, measure to see if you have 12vdc at the fuse itself.
have you checked the earthing continuity-if it's this other bulbs may also partly light when brakes used otherwise- Check continuity of live from center to lh & rh lights and/or is there a live at those lights
most rear tail lights and turn/stop lights are the same dual filiment bulb. it is possible for your tail light to work and your brake light not to and still have a bad bulb. I would check the bulb first, your brake light works on the left yes? this would mean that the fuse is fine