How to Wire Relay for Trunk Release?
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=146102
Printed Date: April 28, 2024 at 5:40 AM
Topic: How to Wire Relay for Trunk Release?
Posted By: rdl212
Subject: How to Wire Relay for Trunk Release?
Date Posted: March 24, 2020 at 7:48 PM
Hello, kind of a newbie to relay use and was wondering if someone could help me out with a correct wiring diagram to utilize a relay to provide a positive 12v pulse to the trunk solenoid to pop it? I have a dpdt relay, a momentary switch to press inside the car to activate, and also want to connect to my car alarms - momentary aux trigger as well. Really appreciate the help. Thanks
Replies:
Posted By: wirewise
Date Posted: March 24, 2020 at 7:53 PM
https://www.the12volt.com/relays/relaydiagram8.html------------- ~wirewise~
Verify all wiring with your meter before making any connections!
Posted By: rdl212
Date Posted: March 24, 2020 at 8:17 PM
Thanks for that link, but unfortunately I’m too much of a newb to even know which I should be looking at. I did find this diagram on 12v - would this be correct? In addition, the momentary switch I have is only good for 5 amps - does that make a difference? Thanks again.
https://www.the12volt.com/installbay/uploads/maxima_trunk_relay.jpg 
Posted By: wirewise
Date Posted: March 24, 2020 at 8:19 PM
No, that provides a negative output. You said you needed a 12V+ output.
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~wirewise~
Verify all wiring with your meter before making any connections!
Posted By: rdl212
Date Posted: March 24, 2020 at 9:23 PM
Thank you. So do I just need to rearrange which pins the+12 v are hooked to?
Posted By: rdl212
Date Posted: March 24, 2020 at 9:28 PM
Ok, I think I am getting closer, but now I am just wondering how to wire in the momentary switch?
Posted By: lectricguy
Date Posted: March 25, 2020 at 7:15 AM
Reverse 30 and 87, momentary switch connects to 87.
Wire as follows:
Fused +12V Constant: Relay pins 86 & 87
Momentary switch: Relay pin 87A
+12V Output to Trunk Solenoid: Relay pin 30
Car alarm trunk (-) output: Relay pin 85
For long term alarm trunk output reliability, it is also recommended to add a general purpose diode (such as 1N4001) across Relay pins 86 and 85, diode band toward Relay pin 86.
The series diode in your original diagram is acceptable as well as an alternative for this purpose, band toward the alarm output.
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Lectric Guy
Posted By: rdl212
Date Posted: March 25, 2020 at 9:04 AM
Excellent, thanks so much that helps a lot. One last clarification - so for the momentary switch I would have 12v to one side of the momentary and the other side to pin 87a?
Posted By: lectricguy
Date Posted: March 25, 2020 at 9:34 AM
Yes, that is correct.
Cheers!
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Lectric Guy
Posted By: rdl212
Date Posted: March 25, 2020 at 10:18 AM
Thanks so much
Posted By: i am an idiot
Date Posted: March 25, 2020 at 8:24 PM
You are going to need a high current switch to do it that way. Use your last diagram just as it is, but also connect the momentary switch to 85 with the wire from your alarm. Ground the other leg of the momentary switch. You can use a low current switch this way.
You do not need a diode. The alarm brain knows you will be connecting a relay to it, there is a diode inside the alarm brain. The backlash will not affect your switch.
Posted By: rdl212
Date Posted: March 25, 2020 at 8:50 PM
Thanks so much for that clarification
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