Why do dodges when they indicate left or right, turn off one headlight. what Is the purpose of that idea can someone please explaine.
I think it just dumb. Maybe I just don't get it. 
I'm not sure I understand the question, but I'll give it a shot. My '00 Neon didn't use the headlights as DRLs, instead it used the front side-marker/turn signal lamps. When the turn indicator was on, the side-marker/turn signal on that side flashed while the other one remained on.
It makes sense in that the headlights didn't have to be on all the time, meaning that they would last a lot longer. In the 8 years I had the Neon the headlights never burned out.
Does that answer your question?