Hombre, presuming you are doing this as enhancement for looks, I have some comments.
1. LED's seldom run on more than 3 volts. 4.5 volts max for some special types. Because the car is 12 volts all over, you have to use a resistor to reduce the voltage to the LED. Failure to do this and pop goes the LED! 2. Not knowing the exact type of LED you are using, I suggest you (or someone you know who is savvy about basic electricity) do an experiement with one LED and a variable resistor, say zero to 3000 ohms. Wire the LED in series with the variable resistor, crank up the var. res. to max, then hook up to the car battery and SLOWLY turn the var. res. down until you get a glow on the LED. If you reduce the var. res. too much, blooie, you loose one LED, no big deal. Once you find the setting on the var. res. that gives you a nice glow without making the LED warm, disconnet the battery, read the var. res. with an meter to find out the value of resistance (I bet it will be around 500 ohms. You goto the local radio shack, get some of that sized resistors, wire (solder it for long life) it to the LED and you can place it wherever on the car. 3. Yes, LED's are diodes and only work one way. Nature of the thang. 4. LED's use very little juice, so you can leave them on for a very, very long time on the amount of power available from a car battery. Like pushing a tonka toy with a D6 bulldozer. Personal warning: If you are goofing around with LED brake lights (you can find them at the junk yard all the time) and come across an array with one long, thin light tube inside, this is a neon array and it runs on a much higher voltage. Be aware that it will give you a zap if you don't handle with care when it's active. Hope this helps.
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