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trouble shooting my LED turn signal system

I would first check to see if theres power at the bulb socket. Process of elimination, start at the source.,
 
Are they front or rear turn signals. If on front is running light portion working?
 
LED's are polarity sensitive.
Regular bulbs will work, no matter the polarity from the factory.

When I replaced my lights w/LED's, one side didn't work.
Even when swapping.
Then I checked the polarity at the socket.
It was reversed from the factory.

Took a little time and got the leads swapped around and then it worked.

Check the polarity!
 
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