proper capacitor to use to trigger 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=125467
Printed Date: May 12, 2025 at 7:51 AM

Topic: proper capacitor to use to trigger relay

Posted By: virtual_mage
Subject: proper capacitor to use to trigger relay
Date Posted: January 05, 2011 at 8:31 AM

I’m installing a set of light on my jeep chose 2 way to trigger the relay with a switch giving me the option to use my high beam or on off as needed. Right now my concern is since the jeep use a canbus system the voltage send to the high beam will be pulsed and could cause some problem with the relay, i would need to install a small capacitor to prevent that . If someone can tell me the proper one to use it would be greatly appreciated.

posted_image

As you can see i already put 2 Diode on the circuit to prevent the circuit to overlap when the switch is used.

Replies:

Posted By: howie ll
Date Posted: January 05, 2011 at 6:11 PM

Why would the high beam voltage at the bulb be pulsed? How would your headlights stay on if that were the case?
You will only need the diode that's shown on the high beam wire.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: oldspark
Date Posted: January 05, 2011 at 6:41 PM

This time Howard, I thank you!!
I was so tempted.... but I thought CANners would do better than me.
I was right again!