Possible ground issue at the taillights.
Check the switch on the brake pedal
if you recenly replaced bulbs u may have installed them backwards they should be running lights and brake lights if this is the case they maybe installed incorrectly
brake light switch would be most common cause
Bad ground on the brake lite circuit.
A bad ground wire will cause dim headlights, or will cause lights not to work.
It may be wired wrong.
i found it to be the tail light harnesses go bad . a common problem with them because the bulb sockets short out.
probably the fuse is blown.
It sounds like a blown fuse or a bad head light switch
BAD BRAKE LIGHT SWITCH AT TOP OF BRAKE PEDAL