Battery light coming on now...help!

Ok...I NEVER had my red battery light come on before...now...after having a new fan put on today, my battery gauge was off to the left, and the light came on...it will be on, needle to left, and then normal....light on and needle to left...normal...about 15 seconds on each...

Can a new fan (that is actually working now) draw that much more power off the battery that it wasn't accustomed to providing before??


Any help would be huge!

thanks!