My drivers brake light problem (always on) was solved as follows. It was not the bulb out relay, the brake light switch, a faulty ground, or mismatched bulbs.

I had replaced both tail lights on this car with some OEM bought on Ebay as the originals were in terrible shape - cracked and leaking badly- also causing bulb out light in dash.

Before installing the replacements I had cleaned all circuit boards contacts and made sure every light bulb was matched left to right. I still had the dreaded bulb out indicator dash light.

I purchased a used bulb out relay on ebay but it proved to be faulty.

The problem was that the WHITE BRAKE LIGHT HOLDER can ONLY be used on the RIGHT TAIL LIGHT (passenger side on US cars). I used a white bulb holder on both sides thinking they should be color matched for easy identification. Big mistake.

If one puts a white bulb holder on the left side you will cause both the bulb out indicator to be on in your dash and the Left brakelight to be on whenever the parking or headlights are turned on.

I wonder how many others have had this problem. No one seemed to be aware of this.
The solution was months in coming! Now if I can just fix that goofy speedometer..