Here's an interesting one... ever since owning my Z (over 8 years), the brake warning light (the "Lights" one, not the handbrake one) came ON when I pressed the brake pedal. Because my brake lights have always worked, I assumed that it was there to tell you that the lights were working! After doing a bit of searching on this good forum, it turns out that not only should it warn you that the brake light(s) are NOT working, but also that a rear fog light conversion (which I have had done) will cause the light to come on when braking even though the brake lights are fine.

 

Now no issues here, but recently I noticed that the light now doesn't come on when I brake. The brake lights work perfectly, the rear fog works perfectly, and the "Lights" warning light still comes on when I first turn the key (as part of the startup lights test) so its not the bulb in the dash.

 

Any ideas what would cause this to start happening? Is there something that runs alongside the wiring to the bulb, like a unit somewhere that's failed or a fuse?

mine only came on when i was a brake light out. somthing funny going on with the rear fog light i would say??

There is a light control box in the boot, rear drivers panel, size of a fag packet. They can occasionally get either a dry joint or water in them making it short circuit.