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It depends on how many amps it is. Normally your car should put out 14v with the headlights on, but if the amps are too small that voltage is going to dip down when you press your brakes, or your fans kick on or you roll up your windows. Then you will see a dip in the voltage that could cause issues with the leds.

I definitely have that issue. I just discovered yesterday that I had a spare LED sitting around, so I've got my gauge cluster illuminated for now. Let's see how long this one lasts before I actually have to break down and buy new lights.

You interior is looking good, solidxsnake.

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WHAT!?!?!?!?!16$ for 50 4000mcd LEDs!?!?!?!!?!?! thats madness!!!, I get american's Best quality LEDs 50 of 13000-23000 MCDs for about the same price!, I'm going to redo my cluster again and remake Lexus RX's 450h LED dimming panel blue lights, and when I take my old LEDs out, Ill make a DYI on how to make those custom bulbs , that way you wont have that LEDs burning out problems, and without having to make anything too complex like custom circuit boards or having to add capps , well I dont need capps because my battery is new, the old one almost screwed up my starter, but luckily I have a Celica, not a honda or an chevrolet lol, thats why my starter still good
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I dont recomend having the resistors being toguether like that, they can over heat!, try to separate them a little, so that they could work a little cooler and last longer
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dude, I roll my windows up, close the sun roof, while stepping on the brake and the car with the fans on and the ac on low and I do that just about everytime I get out of my car around 3-4 times a day At least! and I have LEDs allover my car and not even a single one has gone bad, exept for the gas one which is on all the time ever since I did the LED combersion bulbs, besides that I used to have a bad battery just like 2-3 months ago, and now I have a new one and everything works 100% and no LEDs burnt, so it cant be the voltage unless is too high instead of low, because when you step on the gas the voltage goes up about 1/2 of a volt, maybe the guy who rebuilt the alternator was right, its too strong for the LEDs, just to test you could try changing the resistor and put stronger ones with higher ohms, they LEDs will glow less, but they might not burn out on you as quick as the other ones. good luck
-Adan

This post has been edited by SinisterSinner: Dec 6, 2009 - 12:23 AM

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There is no way a single 20mA LED is going to pull enough current to heat up 5 1/4W resistors

Ironically enough, I noticed today the red/blue LEDs I had lighting the thermostat temp knob aren't lighting. I gotta pull apart my CC unit and check if they burned out. It's quite possible one or both of the red ones burned out, they were rated to 2.3-2.5v I believe, which means putting them in series with two blue LEDs would lead to a slight overvoltage.

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^^ December 5th: I found a spare LED, replaced the bad one, had all my gauge lights working. Two nights ago, I notice a slight flicker in the LED behind the fuel/temp gauge again. Just a light flicker, nothing like it was doing before. Last night, it dies altogether. Looks like it's time for new LED's... again.

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sounds like you are over powering your LED. You need to buy brighter leds and run them at a lower volt.

Remember when doing the resistor calculator to set your supply voltage to 14 volts instead of 12. When the engine is running you should be around 13.5 volts, it is safer to run a LED under the required voltage then to over volt them.

Here is your solution. Add this inline to your altenator.

http://cgi.ebay.ca/Porsche-356C-Bosch-Volt...=item56389e012f

My LEDs that I put in above have been burning out. Pulled out the cluster and put some more in.

I should have remembered that the source isn't a straight 12v =_= It's fine for now but flickering and probably on its way out again later. The regulation on my car is garbage anyhow, have to re-wire the grounds and probably some others. If I brake, all the lights in the car (dash, headlights, dome light, etc) dim, hit the gas and all the lights get brighter. Windows roll faster with the gas hit as well.