Bulb out warning light

[penfest]

I posted recently that the bulb out icon was showing but I could not find a fault in the end it was a tail light but the stop light took its place. I have now changed the bulb but it still didn't work but if I take the stop light bulb out the tail light lights up. Any help would be appreciated.

[Chuckles]

I did not pick up on your first posting so I might be repeating answers here.
"Light-out" is often attributed to the rear number plate light PCB and that can cause all sorts of unrelated issues so I would start there and check all wiring and plugs in the boot area for damage and good connections. A little drop of WD40 often cures a poor connector.
I assume you are using normal bulbs not LED's
The symptoms you are describing do point to grounding issues so pay particular attention to all ground/earth points.
Hope this helps....