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Wow, Can't Help you with your problem, but I have a similar one.... on my 89 F350, I have the right brake light not working normally. Now, if I have my left flasher on, my right brake light works just fine... and my right flasher works fine also... my dome light doesnt work at all... crazy...
It's a ground problem. One of the lights is not grounded properly and it is backfeeding thru the other lights searching for a ground. Also check every bulb closely even if it's working. I have seen a dual filament bulb have one of the filaments broken and it falls down across the other filament causing weird problems.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.