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LED resistors burnt out

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Old Jan 15, 2015 | 03:59 PM
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Default LED resistors burnt out

To whom it may concern,

I have a 2008 corvette c6. Recently I changed all of the lights to LED's. I put 30 W 3 ohm resistors on the front DRLs because the lights were hyperflashing. They were working fine until I recently changed from an AC Delco battery (because it died) to the optima yellow top battery. Now the resistors blew out. I smelled them burning. How do I fix it? Any suggestions? Thank you.
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Old Jan 15, 2015 | 09:39 PM
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Originally Posted by 1sikc6
To whom it may concern,

I have a 2008 corvette c6. Recently I changed all of the lights to LED's. I put 30 W 3 ohm resistors on the front DRLs because the lights were hyperflashing. They were working fine until I recently changed from an AC Delco battery (because it died) to the optima yellow top battery. Now the resistors blew out. I smelled them burning. How do I fix it? Any suggestions? Thank you.
Assuming a 12V supply, your resistor's power dissapation is V * V / R = 12V * 12V / 3 ohm = 48W -- far above the 30W rating.

I would try at least 6 ohm X 30W which would dissapate 24W --- which is still high for a 30W resistor. A better answer would be to connect 2 3 ohm X 30W resistors in series which would dissapate a total of 24W but only 12 W per resistor. I suspect that doubling or even 5X the resistance will still not flash. The other thing to consider is the mounting and placement of the resistors as they must be able to dissipate the heat --- and yes I am a physicist.
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Old Jan 15, 2015 | 09:43 PM
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OMGoodness, that answer is so far above me, I'm speechless.
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Old Jan 15, 2015 | 10:01 PM
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Originally Posted by AORoads
OMGoodness, that answer is so far above me, I'm speechless.
Dont feel bad Bill. It flew over my head too. What I dont get is why did it work fine with one 12v battery and burn out with another?
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Old Jan 15, 2015 | 10:47 PM
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CA275236,

Thank you very much for the information. I can appreciate that you are a physicist. I'm a Math teacher. I'll give it a shot. Be well. ---Christian
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Old Jan 16, 2015 | 01:06 PM
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Can you explain that equation using the common core principle..
Even then I wouldn't get it
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Old Jan 16, 2015 | 01:09 PM
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Originally Posted by AzMotorhead
Can you explain that equation using the common core principle..
Even then I wouldn't get it
You show up, we supply you with breakfast, lunch and dinner, plus a backpack of food for weekends, so you can then sell your food stamps on Craigslist.
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Old Jan 16, 2015 | 06:13 PM
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the resistance due to the weak battery may have started the failure and they just died. Ecklers used to sell a replacement relay for folks with led lights. I actually like the hyperflash. I have new resistors that I never used.
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