Not entirely sure if the two are related but I have issues with one head light and one brake light working I’ve replaced the bulbs but they still don’t work sometimes and they’re both on the drivers side if I flash them on and off enough times and slap the brake light they’ll rush on eventually but not on first try any ideas?

 

Clean/ check the receptacles. If you can tap it and it comes on you have a loose connection. Use dielectric grease too.