Having tail light issues... HELP... LED LIGHTS!

MoNsTaMaCk24

Founding Member
Aug 12, 2002
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Shippensburg, PA
MoNsTaMaCk24 said:
I just read I need resistors due to how much power they take compared to the stock one...

Are you having problems with the flash rate on your turn signals because the stock flasher is (falsely) taking the low current draw of the LED's to be a burned out bulb?

If so, you might want to simply try a different flasher like the Cobra one, PN F67B-13350-BA. The stock Mustang flasher expects to "see" the current draw of three regular bulbs. The Cobra one expects to "see" the current draw of only two regular bulbs. That difference might help you when using LEDs.

Otherwise, you could try opening up and custom modifying your stock flasher to work more correctly with the different current draw.

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Most LED's I have worked with only take about 20ma of current! Depends on the LED but you need a resistance because your running about 12v from the battery using ohms law V=IR and I would imagine they step down the voltage to the tail lights but LED's have very very small resistance so.. that mean that if you applied only 1v to a LED the Current would be Extremely high. Say you have 12v going to the LED that can take 20 ma you would need a 600 ohm resistor 12/.02 = 600. I doubt it's a 6 ohm because that would mean only .12 volts are going to the LED.
 
why would you do that? you do know that you can just order plug and play bulbs that have everything done for you....

i just bought these for my turn signals which are the same bulb as the tail lights
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thats the problem. they are never as bright as regular halogen bulbs even with 20 LEDs :shock:

the secondary function (blinking) is semi-inadequate also. the difference between the low and the brighter blink isnt that drastic and its hard to tell they're blinking. I wouldnt really recommend them just for the brightness factor alone.