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Confused by very simple diagram

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=61462
Printed Date: May 14, 2025 at 11:18 PM


Topic: Confused by very simple diagram

Posted By: e2140
Subject: Confused by very simple diagram
Date Posted: August 16, 2005 at 8:09 PM

I was looking over the basic diagrams under "Relays" in the left hand menu and ran into one that confused me. I showed the diagram to a couple people I know and they came up with the same result that I did:

posted_image

Am I missing something here? Wouldn't the connection from the momentary switch to pole 87 bypass the need for the right relay?



Replies:

Posted By: the12volt
Date Posted: August 16, 2005 at 8:26 PM
That section of wire is there to create a latch so the coil of the relay will stay engaged after the momentary contact switch is opened after being closed once, without it as in the second diagram above, the coil of the relay will only stay engaged while the momentary contact switch is closed and will disengage after the switch is opened.

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Posted By: e2140
Date Posted: August 16, 2005 at 9:06 PM
Ahh! I see it now. I spent a good deal of time trying to figure that one out. I guess I thought that the momentary switch would be held down the entire time the vehicle was starting. Makes sense now, thanks!


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