3rd brake light mod.

[R1dd1cK]

Ok so I'm trying to mod a old led drop light that I have. I'm wanting to build a led 3rd brake light out of it. It has 23 leds and 13 resistors. I am trying to find out what I need to change the resistors to so that it will work with 12v. It originally ran on 3.6v. So I traced the traces and it goes positive to a resistor then resistor to positive of 2 leds and then ground. It looks like I need to take 12v down to 3v.

 

[albi1cnobi1]

You'll need to know the value of the resistors. Most LED's work off of 3.6vdc even in a 12v system. To drop the 12v down for the LED's you would need a total of 450-500 ohms. So figure out what you have already, deduct it from 500 and that's what you'll need to add.

 

[R1dd1cK]

OK thanks so I need 500 ohms. I'm just going to take the old resistors out they are only like 10 ohms.

 

[albi1cnobi1]

You could leave them inline. 510 ohms is fine.

 

[R1dd1cK]

Well today I ordered 500 count of 470 ohm resistors and 500 led's. I'm going to build some custom 3rd brake lights and see how it turns out.

 

[BigRondo]

Standing by......................

 

[R1dd1cK]

The resistors should be here in a few days. Whey they get here I will mod the led drop light I have and see how that looks first.