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.