Have a question about the rear brake lights. They two side rear break lights light up when the brake is pressed (without the headlights turned on). But when the headlights are turned on, if you hit the brake, the two brake lights turn off. The top center brake light does turn on though. Have replaced both of the bulbs. Have checked and replaced the fuses for the brakes and small lights. Have checked the brake switch. Looking for other ideas? Appreciate any and all help!!