Two Sources, Activate Single Relay Wiring

Printed From: the12volt.com
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=145821
Printed Date: May 09, 2025 at 11:30 PM

Topic: Two Sources, Activate Single Relay Wiring

Posted By: ingeld
Subject: Two Sources, Activate Single Relay Wiring
Date Posted: November 30, 2019 at 11:19 AM

I am trying to figure how to properly use two source to activate a single relay but not to back feed power from one source to another. Is there a special relay I need ?

Replies:

Posted By: geepherder
Date Posted: November 30, 2019 at 1:57 PM

You can do what you want with a single relay. The simplest way to keep from backfeeding your sources to each other would be to use diodes.

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My ex once told me I have a perfect face for radio.

Posted By: ingeld
Date Posted: November 30, 2019 at 2:34 PM

What type or part number diodes do i use .

Posted By: geepherder
Date Posted: November 30, 2019 at 3:15 PM

Just generic 1 amp switching diodes will work fine. I don't have a part number.

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My ex once told me I have a perfect face for radio.

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