Wiring for break lights, bulb is fine, no break light

what kind of car(model year)?some tome the signal wire is corrodet or wrong bulb

there shouldent be a junction box it will split from the lomb from the same wire going to the rear of the car if the bulb works and there is no power to wire there will be a break in the wire some where usually it would break where it gets twisted possibley where the wires go into the cluster check to see if cluster is ok all conections work check to make sure that the harness going into cluster is fitted correctley also check does it have two fog lights as most cars only have 1 and the other is a dummy one with a spair bulb if not you can do a splitter wire from the other side to make the light work hope this makes sence ivan uk

If you put the tester on the outlets and it lights up properly but the bulbs dont, you have already concluded that the wiring isn't the problem. unless of course the wires are corroded and simply putting the bulb in shorts it out. Have you tested the bulbs?

check the electrical contacts within the bulb fixture for oxidation or damage. Check also the wires and wire harness for damage or connection problems.

poor ground, check the wire harness, this is the one that comes from front of vehicle to the rear and plugs into the wires that go to the rear lights. trace the wire coming out of the light itself and eventually you will see that it comes to a connector that attaches to the wiring harness.

Check the brake light switch should be a orange wire with 12v then a white wire with 12v when the pedal is pressed.If htat cks good then ck the hazard switch by moving it up and down and wiggeling the knob with the brake pedal pressed if they start working then your multifunction switch is bad and needs to be replaced.

ck light bulbs.

you may have a poor connection where the bulb contacts the wiring. clean all bulbs and sockets. Also, check the high mount stop lamp too.

MAYBE THERE IS A BREAK IN THE WIRE SOMEWHERE

does the Center brake light work ? I think your looking at replacing the brake light switch !