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Discussion Starter #1
I changed out the bulb in my 2007 Mustang rear blinker - the turn signal tail light works now. However when I turn on the turn signal in the car it does the fast blink sound. What did I do wrong?

Thanks for any help.
 

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Did you install a dual filament bulb?

Also, make sure you have the bulb installed correctly. If it's not seated in the socket properly it may cause those issues

Nick C.
 

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I had this issue as well, it ended up being the center bulb on the one side, not the blinker bulb. I think that bulb is for brake and when your lights are on.
 

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And don't use a single LED bulb unless you are using all LED's. Don't mix and match bulbs of those types. Also with using LED's you'd get the quick flash ii you didn't have the resistors installed in the system. Just throwing that out there for the new guys.
 
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