LED Alarm wiring

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=63550
Printed Date: May 13, 2025 at 1:23 AM

Topic: LED Alarm wiring

Posted By: dnt408
Subject: LED Alarm wiring
Date Posted: September 30, 2005 at 2:18 PM

Okay, I know when hooking an LED that is lower voltage, I have to use resisters to match with a car's 12volts. So what if the voltage of the LED is higher than the source I'm taking it from? I plan to replace the the stock Viper 791VX with brighter ones. I read somewhere that these are 2volts right? The led I plan to install specs are Forward Voltage (V) : 3.2 ~ 3.6 / Reverse Current (uA) : <= 30. How do I wire them if I plan to install one and what about if I want to install two? Can I just install them without the resistors? Thanks

Replies:

Posted By: fingaz22
Date Posted: September 30, 2005 at 3:00 PM

you won't need the rersistor if the supply is less than 5 volts. if it is greater than 5 volts a 50 ohm rersistor will drop the voltage 1 volt, 100 ohm resistor will drop the voltage 2 volt and etc.. etc... seeing your led is 3.2 - 3.6 than it should be just fine with a 5 or lower voltage and operate accordingly.hoped i helped lol

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Posted By: dnt408
Date Posted: September 30, 2005 at 8:05 PM

what if I want to wire up 2 of them? Do I wire them up in parallel or serial? thanks