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all 4 turnsignals flashTwo things to look into. Most likely is your hazard switch is failing/shorted inside. Second, if problem started when bulbs were replaced take the bulbs back out and look into the socket, make certain that if the socket has two connectors in the bottom that a dual filament bulb (ie with two contacts on the bottom of the bulb) is what you plug into it. Plugging in a single filament bulb into a dual filament socket shorts the two contacts together causing weird light behaviour.

Hope this helps

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โˆ™ 2011-09-13 17:54:07
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Q: What would cause a vehicles turn signals to turn on both turn signals at the same time like hazard lights?
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