I have a 2000 elantra that has no 'main' brake lights. 3rd brake light is working OK.
Tailights and signals work when headlamps are turned on. Only the main brake lights don't iluminate. Bulbs & fuse (Tail) look OK. I got a wiring diagram out of a repair manual, and it shows the 3rd 'eye' (breaklight) wired to the same bakelight switch hot lead going to the main breal lamps, so if the 3rd eye is working shouldn't the main breaklights?
I noticed the diagram showed a seperate fuse for l & R legs of the circuit, but my fuseblock only has a single fuse for brakes, is there another set in the engine compartment? Could this be battery cable (ground??) related. I recently replaced the cable with an OEM replacement??