holcombe347
+1y
it sounds like your alternator is starting to go bad.
my toyota when i first started driving did that for the longest time (almost a year). i had the alternator tested at the time and it passed and thumbed through the wiring but everything was good and hooked up accordingly. at the time i noticed when my lights were on, brakelights, turn signal were going, it was more noticeable as the load on the electrical system was greater.
one good test is to get in it start it up and put as much load on the electrical system as possible and see if the severity of the flickering gets more pronounced. ie: brakes, highbeams, emergency flasher, blower fan. mine did it for close to a year before the stayed on solid. once those two lights (battery and ebrake) come on solid, that shows that there was an alternator failure. when i ran compressors i would dust an alternator at least once every 6 - 9 months. those lights came on every time when it went out.