Tail lights do not illuminate when the headlights are on. The bulbs are not burnt. All lights still work (brake lights, turn indicators etc.) Is there a burnt fuse perhaps?

Replace the right rear brake light bulb. It is possible that the filament has burnt out and has fallen across to rest on the brake light filament. This would cause the condition you are experiencing.

Possible wrong bulbs installed?

could be a faulty globe too

Headlight switch probably the problem. One circuit is shutting off when the other turns on. If it was a fuse or relay, it would just turn off...

Could be a broken wire at the socket. Sounds like a burnt bulb also. Sometimes a burnt bulb will do the same thing as you are describing. Once you get this fixed, all should work. If flashing to quickly, replace the flasher stat unit!

usualy there is a faulty earth to the bulb cluster remove them and clean all the conectors spray the harness and cluster with wd40 or similer put all bulbs back in and see if that works but i would go with a bad earth hope this helps ivan uk

It may sound silly, but check your brake light bulbs to see if they have been installed incorrectly. Brake light bulbs have two filaments, one for tail light, and a brighter one for brake lights. On some cars if the bulb is installed wrong, the brighter filament will stay on for tail lights. The only other thing I can think of is the wrong bulbs have been installed.

two fuses one for each side of the car ,it uses a combined stop and tail light bulb ,so change the bulbs or test them

Hi: tail is on its own circuit and utilizes the longer thinner element in tthe bulb --- the brake and turn utilize the short thicker element in the bulb---- two different circuits. If bulb fails on tail ligh then the bulb is more than likely burned out. When you take the bulb out, look at the elements and you should see a broken thin filiment. bulb is bad, replace. good luck

Had a similar problem and fixed it by installing a new headlight switch / turn signal lever. Hope this helps.