Grounds for the left tail light
 

Does anyone know were the ground is for an mk3 86.5 na supra? My left tail light isnt working when the headlights are on and the brakes are pressed bulbs are brand new, and the yellow box that is in the back that tells when the tail lights are not working is brand new as well.

The panel in the back that covers up the trunk lock mechanism, take that off and youll see a few wires going to a screw im pretty sure that is the ground for the tail lights.