turn on led @ 0V with 12v being off

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=49364
Printed Date: July 13, 2025 at 1:40 PM

Topic: turn on led @ 0V with 12v being off

Posted By: sl0thy
Subject: turn on led @ 0V with 12v being off
Date Posted: February 04, 2005 at 7:05 PM

Hi, I'm doing some custom stuff to my bike. The stock dash is being removed which has the low level fuel light on it. The low level light is off @12 volts (from signal wire), but when the fuelsending unit see its on reserve it drops to 0v on the signal wire and turns the led on in the dash. Is there a way to wire this up to a relay to turn on a led when the voltage goes to 0v.

Replies:

Posted By: hotwaterwizard
Date Posted: February 05, 2005 at 1:55 AM

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: February 05, 2005 at 1:57 AM

OOPS Wrong Circuit Sorry

Here is the NEW ONE

You know the LED needs a Resistor on it.

posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: sl0thy
Date Posted: February 05, 2005 at 11:34 AM

thank you very much, ill try it out tonight

-brian

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