The high mount brake light on my 1996 Ford Explorer went out. There were several years where Ford installed neon lights instead of standard bulbs. There are 2 primary components to these light assemblies, (1) Ballast (2) Neon bulb. Most of my research suggests that the ballast is the component that fails and that's exactly what happened in my case. This instructable is limited to changing of the ballast.
***Don't forget to disconnect the battery before starting this instructable***
Step 1: DISCONNECT THE BATTERY!!!
DISCONNECT THE BATTERY!!!
The voltage gets stepped up to run the neon bulb. You don't want to get shocked.
Step 2: Accessing the Ballast
Pull the trim back to access the ballast.
You may need a screw driver to get under the trim.
Step 3: Disconnecting the Baslast
Partially remove the ballast.
There are 3 plugs you need to disconnect.
On the left side of the assembly there is a 12v connector. Disconnect that one.
On the right side of the assembly there are 2 individual connectors. Disconnect both. They are colored coded. One is white and one is green.
Step 4: Installing the Ballast
Install the new ballast by reversing the steps. The process is simple enough I didn't feel you would need the instructions.
Don't forget to reconnect the battery and test out the light.
If this doesn't fix the issue then its likely the bulb. That's an instructable I hope I don't get a chance to write. That involves drilling out rivets and more.