Just bought a 2000 Isuzu Rodeo for my daughter's snowboarding adventures. Having issues with the rear brake lights. With the headliights/taillights off, everything is normal, all brake lights work. With the headlights/taillights on, the third brake light is illuminated dim and when you activate the brakes the third light is brite but no brake lights on the corners.
Any ideas!!!

 

Problem solved by replacing the the brake light bulbs.

 

Good to know. Thanks