I recently had a tail light stop working on my 380GT. Obviously, I figured the bulb had blown so I changed it however, that didn't fix the problem. I then switched bulbs on both sides and the LHS tail light would always work whereas the RHS would fail with the working bulbs.

Now I'm thinking this may being wiring related however I don't know where to go from here. Any help would be appreciated!

P.S. I've been unable to find this answer by searching. If somebody can find a thread to help, please let me know!

Have you checked the plug to see if all wiring are intact? Have you measured the voltage at the plug?

Do you have a wiring loom fitted for a tow bar ? i had some intermittent problems with rear lights and discovered that one of the wires had broken away where the tow bar loom was connected