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  #1  
Old 03-20-2010, 10:51 AM
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Question Question Regarding Replacement LED Bulbs

I have a question regarding LED bulbs as a replacement for factory parking, tail, signal, brake, cargo, and reverse lights. I have read from many websites that sell the bulbs state that some of the newer vehicles may require a load resistor to keep the vehicle from thinking that a bulb is out, do to the low wattage draw of the LED. Also some of the sites have stated that, with some newer vehicles, the stock blinker relays will not work with the LED’s and that a different relay is needed.

My question is, will my 2009 1500 need the load resistors and aftermarket blinker relays in order to use the LED bulbs without any problems?

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Old 03-20-2010, 11:08 AM
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Hmmm, MADDOG recently put LEDs in his headlight turn signals and he said he needed a resistor, because without one they flash rapidly and the truck beeps at you. So you'll probably need load resistors for them. I'll let someone with first-hand experience chime in for the rest.
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Old 03-20-2010, 09:41 PM
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For any bulb that flashes, you NEED a resistor or it flashes at about 4x the regular rate and sets the 'bulb out' alarm off. I've never had to put a resistor on a bulb that didn't flash and I've changed every one in my '07 to LEDs.
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Old 03-22-2010, 07:48 PM
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Awesome, thanks for the help guys.
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Old 03-22-2010, 07:49 PM
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Yes, you'll need a load resistor on any circuit that has a bulb that blinks. You won't need one for a steady state bulb circuit, such as the back up lights or brake lights unless the brake light circuit also serves a bulb that blinks, such as a combination turn/stop/tail light. Most 3157 bulbs are dual function so if they blink, they need a resistor.

For a 3157 blinking bulb, I suggest a 6ohm/50 watt load resistor kit. Do a quick google for LED bulbs and most online sellers have the resistor kits wired up and ready to go.

It's interesting...some sellers recommend resistors for LED marker lights as well. I assume those are ones that blink and take a 194 base bulb so the resistor value would be different than a 3157 bulb circuit.

Last edited by erm; 03-22-2010 at 07:54 PM.
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Old 03-22-2010, 09:43 PM
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I can vouch for this as well. If you are putting LEDs in your brake lights or turning lights yuo have the put the resistor. You can get them really cheap so it is not that bad
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