It's been something that has bugged me for years, and I've never been given a good answer for it.
Have you ever noticed that EVERY Chrysler vehicle shuts off a headlight when a signal light is flashing? Picture it in your head- the Caravan above is driving around with its headlights on, and comes to a stop sign and wants to turn right. The driver signals the right turn, and the right headlamp goes off while the signal light flashes. Once the signal light shuts off, the headlight goes back on to normal. This happens with daytime running lights too. And it's not limited to vehicles that have both lights in one housing- it doesn't matter, and it happens to every single Chrysler vehicle- Dodge, Chrysler, Jeep, you name it.
So, why does it do this?
Some have postulated that it has to do with minimum distances for lights in the law- but that doesn't hold weight, because lots of other cars have similar setups to Chrysler vehicles, and they don't exhibit the same behaviour.