skycopter1

I have a 95 -sc400, had the same problem. Shortly after these problems began the top idler pulley crapped out. Changed out the idler pulley...no more problem. Because the problems are intermittent and the circuits affected wouldn't normally have any effect on one another, it' probably safe to assume a short circuit. Because the brake pedal moves and seems to be the trigger in some of these transient events, a good place to start looking for bare wires or shorts might be around the brake pedal swing up under the dash. While the symptoms don't make it possible to guess exactly where the problem might be, wires which could affect brake lights, radio, and headlights all run through the same general area in the vicinity of the driver side under the dash. For example, one place some of these wires would be in close proximity to one another is in and around the driver side fuse panel (check all fuses while you're in there). Naturally, bare wires or wires that may have been cut and taped, etc, (as in stereo modifications) should be treated as suspects. Look for anything that appears to be modified or not well done. Loose connections and even open fuses can also cause phantom syptoms and responses in seemingly unrelated circuits.