Looking for latching relay.

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=144146
Printed Date: May 12, 2025 at 1:49 PM

Topic: Looking for latching relay.

Posted By: blackimpala
Subject: Looking for latching relay.
Date Posted: February 11, 2018 at 11:29 AM

First off I am not an electronics guy, don't use big words. I have a classic car that I am using an A/C compressor to build compressed air. I need something to control the compressor, I want to turn it on with a switch and have it turn off when I turn the key off (but) when I start the car again the compressor will stay off until I use the switch again. I have search this online until I am confused.

Thanks for any help.
Floyd

Replies:

Posted By: the12volt
Date Posted: February 11, 2018 at 11:42 AM

You can use the right relay only from the following setup. Instead of connecting the lead going to terminal 85 of the left relay, connect it to the 12V+ input of your compressor.
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Posted By: the12volt
Date Posted: February 11, 2018 at 11:54 AM

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Posted By: blackimpala
Date Posted: February 11, 2018 at 5:25 PM

Thank you very much. Looks like what I was needing.---Question,the 12volt ingnition input is not clear but I am guessing it is (+)? Is that correct?

Floyd

Posted By: the12volt
Date Posted: February 11, 2018 at 6:25 PM

Yes.

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