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The left rear brake light and blinker stopped working on my 4-door 2007 Wrangler Unlimited, Sahara Edition. Then both started working again.

Is there a single part, whether a relay, terminal block, or something else, that both signals pass through that could be going bad?
 

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I believe it's a double filament bulb. Take the bulb out & look at it. If the glass has a black/gray tint to it. Replace the bulb. If it doesn't, get a magnified glass & look at the filament to see if you can see a partially open circuit. You can tap it as well to help you see if it's loose.
 
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