my lexus ls 400 for some reason when i put my headlights on the car struggles to make it down the street and the rpm level goes really high but when the headlights are off the car runs normal has anyone heard of this problem or know how to fix it, i need help ASAP i have to be at work at 6am mon-fri but i have been getting to work late because i have to wait until the sun comes out just to drive PLEASE HELP!!!!!!

 

i think it's ur alternator....

 

Or battery cables or ground or your wire on your trunk lid is broken.