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Momentary to Constant Relay

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=6321
Printed Date: July 22, 2025 at 8:05 AM


Topic: Momentary to Constant Relay

Posted By: freakystyley990
Subject: Momentary to Constant Relay
Date Posted: December 06, 2002 at 11:25 AM

When hooking up a momentary to constant relay circuit, do I absolutely have to put a diode across the coil? If I don't, what will happen?

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FreakyStyley990



Replies:

Posted By: chasesaccessori
Date Posted: December 06, 2002 at 11:39 AM
It will not stay latched!

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(owner/installer)
Chase's Accessories
Ridgecrest, CA
in business since 92



Posted By: the12volt
Date Posted: December 06, 2002 at 11:55 AM
Actually it will stay latched but a diode should be used to prevent a voltage spike across the coil of the relay.




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