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Unread 12-26-2013, 10:15 PM   #1
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Default LED Front Signal Issues

Hi Everybody i just installed LED bumber lights in my 1999 gmc sierra and now the blink twice as fast. i dont think they are hooked up backwards but thats my first thing to try tomorrow. Any ideas??
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Unread 12-26-2013, 10:37 PM   #2
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LED lights draw very little current so the signal flasher thinks a light is out and flashes twice as fast. This is a normal issue with LED in signal lights.

I don't have LED but I think that the LED guys install a resistor in the wire at the light to increase the current so it flashes at normal speed. No I don't know what resistance is needed.

Here is a link to a flasher with the no-load feature disabled,

Or this Youtube on how to mod your flasher.
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Unread 12-27-2013, 12:02 AM   #3
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FWIW you can also buy a transistorized flasher at any auto parts store.
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Unread 12-27-2013, 05:41 PM   #4
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Unlike incandescent bulbs, LED's will only light up when installed in one direction. If the bulb is lit, then it's installed in the base correctly.

I have done several LED swaps into cars that originally had incandescent bulbs; First and foremost, avoid using resistors as that is typically not a safe way to do an install, instead use a proper electronic flasher.

Electronic flashers are available at most parts stores like Autozone or Advance Auto, with the Tridon EP-35 being the unit that I like to use myself. These are available for under $10 and are designed as a stock replacement so no wiring modifications are needed, making the swap as painless and easy as possible.

All you need to do is the find the proper E-flasher for your truck and swap out the old flasher for the new one. Your bulbs will flash at the proper speed once this is done!
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