hello, i have a 2007 dodge nitro slt. when i have my headlights on and press my air horns(2), the headlights flicker. i disconnected (1) horn and tried it again and the same thing, the headlights flicker.

the headlights are aftermarket, sylvania silverstar. my main concern is what is causing the headlights to flicker, weak battery or bad alternator? the other instrument lights and radio and etc. are of no problem.

thankyou for your help!!!!!!!!!!!!!

mcnabb in louisiana............