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In many cases, the brake light and the turn signal use the same bulb.
the bulb with two elements in it is the turn signal and brake light bulb
most likely a bulb b/c if it was the fuse your other brake and signal light wouldn't work... most vehicles the brake and signal light are all in one bulb... try replacing the light bulb
most modern cars have a bulb that share the duty.. the bulb has two filaments, one acts as the marker light, and the other works as a turn signal when activated, or as the brake light when the turn signal is not activated
change the light bulb,
If you have the same bulb for brake and signal, brake light power needs to be interrupted by the signal lights, The brake circuit has to go through the signal light switch so the problem could be there.
tail/stop/turn signal bulb # 3057 park/turn signal bulb # 3157NA
because there is two filiments in the bulb one for brake and signal light and one for running light
Check and make sure you have the correct bulb. The turn signal/brake light is a dual element bulb and if you have a single element it does not work properly.
This is because the tail light bulb has a different element in the bulb. Just replace the bulb and that will fix the problem.
Usually when ones turn signal is blinking fast its telling you that a turn signal bulb (and in some cases a brake light bulb) is out. If it blinks fast when you turn on the the left signal the burnt out bulb is on that side of the vehicle (could be front or rear bulb so you'll have to check). And vice versa
If only the right rear brake/signal light is effected it is not the fuse. Inspect the right rear brake/signal bulb, socket and wiring.