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Lighting Forum
Angel Eyes, DDEs, lighted rings, Clear Turn Signals, LEDs, Xenon, HID, or Bi-Xenon. If it lights up and you want to discuss it, post here!

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Old 01-25-2017, 03:54 PM   #1
kristap
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Keeping my e46 M3 tail lights - do I need resistors?

This is for a track car so cluster warnings and turn signals are not part of the equation. I'm looking to simplify the wiring harness and will lose the LCM. I've found that I can put 12v to the tail lights via brake switch and voila - brake lights.

This is what I want - as simple as possible. However, I don't know how the resistors (frequently part of the discussion around LED tail lights) fit into this setup. Do I need resistors?
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Old 02-04-2017, 11:43 AM   #2
sillieidiot
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You shouldn't need them as they are integrated into the tail lights. If it's the OE LED tail lights. Aftermarket ones will have the resistor packs hanging outside. All the other resistors are usually for bulb replacements.
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Old 02-05-2017, 03:40 PM   #3
kristap
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Originally Posted by sillieidiot View Post
You shouldn't need them as they are integrated into the tail lights. If it's the OE LED tail lights. Aftermarket ones will have the resistor packs hanging outside. All the other resistors are usually for bulb replacements.
Great - thank you for the advice.
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Old 02-17-2017, 12:30 PM   #4
protocol1
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FFR, if adding resistors is requried for a particular setup, wire the resistors in parallel with the LED lamps. Use Ohm's law to calculate the resistor value in Ohms and Watts power dissipation rating to be equivalent to the original stock lamp resistance and Watts. This will fix lamp failure warning system errors.
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