Pulsating or flickering headlights

My04 Toyota tundra started to do this flickering. I haven't really noticed it in the interior. Matter of fact the only thing I do notice is my battery light comes on and off when I press down on the gas a bit more abruptly it stops, but then comes right back on. So that flickers on and off. My headlights I really didn't notice them until last night. I thought I was getting pulled over or some silly b.s. like that. But I notice on a lone highway my lights are flickering from dim to high? Anyone with any help it would be much appreciated. Thank you

 

Sounds like an alternator problem. Not putting out enough volts.

 

Check your battery connection they are clean a good and have a good ground... if they are good goto any parts store have them do a test on battery, alternator, starter....

Have fun pulling the alternator out..

 

I actually figured out the issue. I just had a mechanic put a new alternator in. Really stupid of me because the dumbass put an 80v and for my tundra with tow package needs a 120v. So this may be a problem with allot of flickering problems. The alternator is new but not enough juice causing the lights to flicker.