Quote:
Originally Posted by Jeikun
Here is the link to the Nasioc thread.
I usually keep my dash lighting at full brightness so I guess that it doesn't really matter either way.
If I were to tap into my 12v head unit illumination circuit, would that make the leds dim with the dash?
Say I wanted to use a total of 4 red LEDs, how would I determine the right brightness/resistor for it, just to buy a few and try them? Also, in this case, should I set up a mock circuit using batteries and test using that?
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Subarus use a variable ground for dimming the lights. So the ILL circuit is always +12V, but the ground has a variable resistor on it to dim the lights. So, you can tap the +12V ILL circuit and use your own ground for fixed lighting that only comes on with the head lights, or tap both the ILL +12V and the ILL Ground if you want them to dim w/ the dimmer knob.
To determine the proper LEDs, you need to know the specs of the LEDs you're going to use. LED in serial are additive, so if you're using 4 LEDs on 12V, you'll need them each to be 3V LEDs. (Here's a short tutorial:
http://www.theledlight.com/ledcircuits.html) You want to make sure you don't put too many volts across an LED because you'll destroy its lifespan in a hurry (if not destroy it immediately).
If you need help learning to splice wires and solder, I can probably give you a hand. It's not hard to learn, and it's a really useful skill to have when it comes to screwing around w/ auto wiring.