How to Fix a Fast Blink in LED Turn Signals

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Normally when you flip your turn signal switch, the light blinks at a set, slow pace. However, if you have modified your lights to use LEDs, you'll notice that the turn signals now blink very quickly. This is caused by the low resistance of the LEDs due to the fact that they use less energy. To correct the problem, you'll need to wire the turn signals in a parallel circuit. To do this, you'll be installing a resistor.

Things You'll Need

  • 8 Ohm, 20-watt wire-wound resistors
  • 1- gauge wire
  • Heat sink compound
  • Socket wrench
  • Socket set
  • Wire strippers
  • Wire clippers
  • Soldering gun
  • Safety wire or electrical tape
  • Disconnect the negative cable from the battery. Loosen the retaining nut on the clamp that is secured to the negative battery terminal. Then, slide the cable off the terminal.

  • Open the hood and locate the turn signal lights. They will be located on the outside of the headlights towards the fender.

  • Remove a section of protective coating on the wiring for both the power and ground wire running to the turn signal. You'll need to use wire strippers for this. Remove a section of wiring that is close to the subframe where you will mount the resistor.

  • Solder a section of 18-gauge wire to each end of the resistor.

  • Solder the other end of each wire you just soldered to the positive and negative wires for the turn signal. Since this is a resistor, polarity does not matter (it doesn't matter which wires on the resistor get soldered to which turn signal wires).

  • Place a liberal amount of heat sink compound on the bottom of the resistor and secure the resistor to a free area on the subframe with safety wire or high-temp electrical tape.

  • Repeat steps three to six for every turn signal light (including the rear lights). You must do all lights for the fast blink LED problem to be solved. Each light must have increased resistance.

Tips & Warnings

  • For specific information on how your vehicle's turn signals are wired, consult the particular vehicle's manual (see Resources).

References

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