I have a '94 Explorer. The other day I noticed my brake lights were completely out. I checked the fuse, the wires for a short and the brakeswitch shows continuity when the pedal is pressed. I noticed another thread of the same nature, but it continues on without mentioning what the fix was and then they talk about wireless networks and such. Also, I noticed behind the back driver side panel where the rear window wash resevoir is located, there is a box with a heatsink and many wires coming from it. What would that be? My haynes manual appears to not cover it at all. Just curious. There are also 3 relays that are not covered in the same area. What are they for?