I have a 1994 XJS convertable V-12.
When I turn on the head lights, no other lights come on at all, just the head lights.
No parking lights, no tail lights, no side marker lights and finally, no instrument lights.

I have checked all the fuses in the car in all four fuse panels with a meter and they all check good.

Any ideas or sugestions are greatly appreciated

 

It was a bad relay under the hood on the left front side, in the row of relays.