Need help with DRL Relay

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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=29958
Printed Date: July 21, 2025 at 12:46 AM

Topic: Need help with DRL Relay

Posted By: Kasteo
Subject: Need help with DRL Relay
Date Posted: April 08, 2004 at 2:01 AM

This is the DRL(Daytime Running Light) relay diagram(Omron).

posted_image

I need to wire it to my foglight to make it as a DRL instead of using the headlight. I will wire it directly to the battery and a switch that I can choose the DRL mode(60%output) or the regular foglight mode(100%output).

I don't have much knowledge about the electronic stuffs. All I need to know is how can I connect this relay to foglights, switch, and battery.

Thank you, posted_image

Replies:

Posted By: Kasteo
Date Posted: April 10, 2004 at 12:34 AM

OK. Finally, I got it work, but the problem is the DRL relay is just a regular relay. First I thought DRL relay has a build-in resistor, but it's not.
My question is what the resistor number do I need to convert 12V to 10V to make the light dim when I select the DRL mode.

Posted By: terryr
Date Posted: April 12, 2004 at 11:59 AM

There was a website that used a relay and two '1ohm 25 watt resistors in series'. I saved the drawing but not the site. It was on a motorhome tips site.

I just did a search and was amazed how many people hate DRLs. Most websites tell how to take them out.

Posted By: terryr
Date Posted: April 12, 2004 at 12:02 PM

No, make that In Parallel.

(wheres the edit button?)

Posted By: Kasteo
Date Posted: April 12, 2004 at 9:12 PM

Could you send me those drawing diagram? kasteo@hotmail.com.
Thank you. :)

Posted By: mladams
Date Posted: April 28, 2004 at 11:50 AM

I think the easiest way to run them at a lower voltage is to simply run the lamps in series instead of parallel if they are not already in parallel. the voltage will drop evenly across the two bulbs. there is a diagram on this site under relays as to how to switch between parallel and series. That whould work well or if that doesn't work you can play around with different resistors to get the brightness you want. I know that GM uses the high beams in series to dimm the voltage and create the DRL's.

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Matt Adams
Electrical Engineer Major
York College of PA
Chevy Cavy Rally Sport