LED bulbs

Lord Sparky said

Yes, they use less juice. I only did LED for my front park and rear brake and backup. Brighter. They worked without new LED flashers. They did not work with the LED flashers.

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I did the same bulb replacement as you. Mine would not work with the stock flasher, and would not work initially with the electronic LED flasher. I had to reverse the leads going to the flasher plug, they all work fine now. It has to with polarity being correct for the LED's. I found that information in another thread here.