what size resistor - Subaru WRX Forum
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post #1 of 1 Old 12-06-2004, 11:03 AM Thread Starter
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what size resistor

I have replaced the lights in my instrument cluster with blue LEDs. Looks awesome I just want the needles to glow a little more, since the LEDs I bought are focused and not wide angle I found this site that told me that the dash wiring is not 12v but actually 9.5v.


upon their recommendations I bought the 330Ohm resistors and wired the LED up. Worked great except for the fact that it(resistor) was really hot. Hot enough to make me not want to button everything up and possible melt something over long periods of time. So I dont think it is 9.5v like they stated.

so my question to anyone that might know, is there a formula or an easy way for me to figure out what size of resistor I would need?

since I dont know what would be need off of the specs for the LED for a formula, I will post the link here. http://superbrightleds.com/specs/b3mm_specs.htm

thanks for the help in advance

EDIT: I found this site http://www.bit-tech.net/article/68/

but am confused about what to plug in there, so I am a little closer.

Last edited by Jave; 12-06-2004 at 11:50 AM.
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