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Relays, to diode or not to diode

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=29102
Printed Date: September 13, 2025 at 8:12 AM


Topic: Relays, to diode or not to diode

Posted By: ONEITALIANICE
Subject: Relays, to diode or not to diode
Date Posted: March 27, 2004 at 8:38 AM

I would like to know the following about Relays (SPDT) units:

1) When do you use the internal diode (Clamping diode) style, sometimes, all the time, or never?

2) What wire (alarm module) do you use to control the coil 86 or 85, is there a Rule of Thumb?

3) Can you use the non internal diode type all the time, just to make the choice easier?




Replies:

Posted By: Velocity Motors
Date Posted: March 27, 2004 at 10:24 AM

1. I never do and if I need a diode I always use one inline that I install ( most of the time it's a 1n4001 1 amp diode )

2. There's really not any difference ( if there's no diode ) but if you want to play it by the books, 86 should be (+) and 85 should be (-) with the diode cathode band facing pin 85

3. Yes, that's what I do.



-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA


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