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HelloCustomer I am sending the wiring for the stop and tail lamps for your car.You should have power coming in on the white /tan wire with the brakes applied,the black/yellow is the tail lamps, power there with the tail lights turned on. It shows a black as the ground. The bulbs have 2 filaments and share the ground,you can have one filament burnt out . If you have power at the white tan with the brakes applied you either have a burnt filament, or a problem with the ground.Here is the diagram,Jerry.