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diodes across relay coils

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=16331
Printed Date: July 18, 2025 at 3:57 PM


Topic: diodes across relay coils

Posted By: tazzyt25
Subject: diodes across relay coils
Date Posted: July 15, 2003 at 12:46 PM

could someone make sure i have this right...

to place a diode across the coil of a relay, i would connect +12 and the anode to terminal 85 and i would connect ground and the cathode to terminal 86 on a standard SPDT relay.

if this is correct, please let me know.. if not, please correct me...

thanks




Replies:

Posted By: xetmes
Date Posted: July 15, 2003 at 2:07 PM
No the other way around, Positive to the cathode and ground to the anode. If you hook it up that way the diode is going to pass most of the current and the relays coil will not get enough current, plus it would defeat the purpose of the kick-back diode.


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