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Key-free listening relay 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=10527
Printed Date: June 08, 2025 at 1:58 AM


Topic: Key-free listening relay diagram

Posted By: epicminis
Subject: Key-free listening relay diagram
Date Posted: March 06, 2003 at 9:02 PM

 Hi to all, i'm looking for a diagram that shows how to wire relays so that when you turn off your vehicle, the radio stays on until you open the door. I did this years ago, but have forgotten exactly how to wire the relays up. Any help especially a diagram would be appreciated!



Replies:

Posted By: cpgoose
Date Posted: March 07, 2003 at 7:42 AM
hey, I believe this is what you're looking for. I have no idea if it works or not, I'm just the messenger posted_image

https://www.the12volt.com/installbay/forum_posts.asp?tid=9724&KW=radio+door+open



Posted By: the12volt
Date Posted: March 07, 2003 at 8:22 AM
posted_image

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Posted By: the12volt
Date Posted: March 07, 2003 at 8:28 AM

Edited: Just a note, to prevent other circuits that share the radio's accessory lead from seeing 12V+ when the key is off, cut the accessory lead and add two 1 amp diodes as shown below.

posted_image



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Posted By: epicminis
Date Posted: March 07, 2003 at 2:34 PM

THANKS GUYS! That's what I needed. You guys RULE.




Posted By: the12volt
Date Posted: March 07, 2003 at 2:50 PM
You're welcome, however, my second diagram has a problem. If the key is on, the radio will turn off when you open the door. I'm about to head out , but as soon as I get the chance, I'll post an updated version here.  

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Posted By: the12volt
Date Posted: March 07, 2003 at 4:11 PM

Here's the fix to isolate the radio frrom anything else on the same circuit without it turning off when you open a door with the key in the accessory position.

posted_image



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Posted By: themagicone
Date Posted: March 07, 2003 at 4:37 PM
there is also a solid state eltronic chip you can use 525 timer or something like that, search around.




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