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Old 10-17-2005, 01:42 AM
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changing dash lights to LEDs need some help

hey folks,
Want to change the dash lights i have to LEDs I know i need a resistor if i want to hook up one to 12 volts.

The question i have is will it hurt me to use the resistors on all of them weather it is hooked up in series or not?

I plan to change all of the dash lights i have in my Monte Carlo over to a LED . instead of the 194 bulbs , Also the switch lights that look like a LED but are the wrong color for the rest of the dash lights.

I know you can wire LEDS in series directly in to 12 volt and each one will lower the voltage so it wont blow them in you have i think it is 4 in line with each other. but im looking at wiring like 4-6 of them in line with each other with a 12 volt hook up. i have to solder the resistors on them to do this so if i can put one on each it would be easier to just do all of them instead of trying to get some with and some with out.

but will it drop the voltage o much?

hope that makes sens to someone else besides me Thanks

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Old 10-17-2005, 02:10 AM
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Quote:
Originally Posted by mickey1031
hey folks,
Want to change the dash lights i have to LEDs I know i need a resistor if i want to hook up one to 12 volts.

The question i have is will it hurt me to use the resistors on all of them weather it is hooked up in series or not?

I plan to change all of the dash lights i have in my Monte Carlo over to a LED . instead of the 194 bulbs , Also the switch lights that look like a LED but are the wrong color for the rest of the dash lights.

I know you can wire LEDS in series directly in to 12 volt and each one will lower the voltage so it wont blow them in you have i think it is 4 in line with each other. but im looking at wiring like 4-6 of them in line with each other with a 12 volt hook up. i have to solder the resistors on them to do this so if i can put one on each it would be easier to just do all of them instead of trying to get some with and some with out.

but will it drop the voltage o much?

hope that makes sens to someone else besides me Thanks
Doc here,

Each LED is a diode..it has voltage drops as it forward biases.That value will be marked on the package..while it is small for each, it will become additive.. You can series/Parallel them to a point (resistors or not..) where the total voltage drop exceeds the voltage required to make the string run..

EXAMPLE IN LAMPS:
If you take 2 six volt lamps and run them in series, at 12 volts they will light fine..add a third and they barely glow, add a fourth and None of them work..LED's operate much the same way...Also in LEDs as in lamps wired in this config..If lose one, You lose them all..

A better Shot is, They Make a SUPER BRIGHT LED (Rat Shack, $2.99 each) that is about 1/4 inch in diameter (maybe smaller..)that will run on 12 volts exclusively..no resistance required..

Use those and wire them in Parallel from your dimmer circuit..and it will work fine..

And if nothing else is on that line, (other incandescent lamps) don"t forget to lower the fuse to something like 7/10 ths of an amp..

Doc
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Old 10-17-2005, 05:21 AM
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kool thanks Doc!!!!
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Old 10-17-2005, 06:05 AM
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You can buy various colored 12v LED bulbs from several sources. I bought mine from either Mouser.com electronics or digikey.com They have a much better selection that Radio Shak.

Vince
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Old 10-18-2005, 09:55 PM
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Another option is to just pick-up some direct replacement plug-in LED's.
These guys have it all.....http://www.ledtronics.com/
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