hi again everyone so my left rear tailight was not working and was told this was down to the black box sensor hanging off the loom so got another one plugged it in and it worked again... for all of 30 seconds then went off i unplugged the black box to see if if was a dodgy connection and caught a wiff of burning smell on the connectors (the drivers side rear light still worked the whole time even with the burning smell) so obvioiusly i checked for a short couldnt find one and then checked the bulbs and they were fine so im abit confused to why it is not working surley if there was a short it would trip out the whole off the box and none off the lights would work but the drivers side still works fine any ideas and soloutions would be appreciated thanks

the little black box your refering to is probly shorting out and not working correctly, then it does ,so probly time to replace it. 20 quid for one if you ask.

hi thanks for reply i have replaced it im on my second black box now and it worked for 30 secs then went off so checked connections and was a burning smell but cant understand why 1 light would work but the other wouldnt?

Sounds like you need to trace the wires back, it's possible someone has been messing with them.