wiring relay for play button
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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=114679
Printed Date: April 29, 2024 at 5:52 AM
Topic: wiring relay for play button
Posted By: uluahunter
Subject: wiring relay for play button
Date Posted: June 25, 2009 at 4:10 AM
Aloha all!!! I am new to this site and a newbie to wiring and installations. I've always had my car audio and security systems professionally installed and have had limited knowledge of the inner workings. I understand some the basics, and would like to learn more.
My question pertains to wiring a relay for a "play button" in my van. I've had a play button installed before in one of my previous trucks. To better explain, my reference to a "play button" is basically a push-to-make switch that when toggled will trigger the car alarm siren...kinda like how a car horn would work. My friends and I would use these play buttons in passing or when departing or just as a form of communication when driving.
I've done some research on the forums and on-line, and thought that I understood how the set up should work, but yet I can't seem to figure it out. Here's how I currently have it set up...
30 = constant 12V source (direct to car battery +, fused)
85 = ground
86 = trigger or play button + (negative wire grounded)
87 = alarm siren + (negative wire grounded)
Can someone please tell me if this is right or wrong, or if I am totally off track and need to start anew?
Thanks!!!
Replies:
Posted By: i am an idiot
Date Posted: June 25, 2009 at 5:55 AM
On the play button, one wire needs to go to 86 and the other wire needs to be connected to 12V ignition or constant source. According to what I am reading, you have the play button grounded. It needs power.
Posted By: howie ll
Date Posted: June 25, 2009 at 12:15 PM
We need another crystal ball here Craig, What Siren is it. Remember, nowadays most Sirens are grounded with a pos feed from the alarm. Earlier Cliffords were pos fed and neg (yellow) switching from alarm. This also won't work on some battery back-up sirens because the "trigger" from the alarm is data. Assuming a later type, pos i.e. brown on DEI, ground to switch, switch output to 85, 12v+ at 5amp to 86 and 30, output from 87 to Siren. Come to think of it Sirens only draw about 2 amps, you could just as well, depending on the switch rating, take 12v+ to switch, output to siren brown(?) wire. Remember relays aren't neccessary unless you're switch high power from low or polarity. I wouln't use one in this application.
Posted By: uluahunter
Date Posted: June 25, 2009 at 4:32 PM
i am an idiot wrote:
On the play button, one wire needs to go to 86 and the other wire needs to be connected to 12V ignition or constant source. According to what I am reading, you have the play button grounded. It needs power.
Thanks for the advice! I do have the push-to-make button (play button) grounded. So I should connect the negative directly to the battery...correct? I'll try that.
Posted By: howie ll
Date Posted: June 25, 2009 at 5:24 PM
Not the batttery too much effort, go to fuse box or ignition as Mr. Idiot suggests, I still don't see why a relay is needed, the Siren only draws about 11/2amps.
Posted By: i am an idiot
Date Posted: June 25, 2009 at 6:11 PM
Good point Howie. Is this a siren for your alarm system? Or is it just a second siren. If you are using your alarm's siren, we can still make this happen in an even safer (for your alarm brain) manner. Let me know if you are using an existing alarm siren.
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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB
Posted By: uluahunter
Date Posted: June 25, 2009 at 6:22 PM
Thanks again guys! This is a 2nd siren that I am adding just for this purpose. How would I go about tying this into the existing alarm's siren without harming the brain? Btw, this is installed in a 2006 Toyota Sienna.
Posted By: i am an idiot
Date Posted: June 25, 2009 at 8:15 PM
30 to your existing siren 87A to the alarm's siren wire. 87 to constant or switched 12 volts. 85 to ground. Just for you Howie. 86 to your play button switch. other side of switch to power. When the relay is not energized by your button, the voltage from the alarm is allowed to pass from 87A to 30 to get to your siren. When you press the button, the relay will energize and supply power to pin 30 which will power your siren. Injecting 12 volts into an alarm's siren wire SHOULD not damage an alarm brain. Notice I said should not. ------------- Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB
Posted By: uluahunter
Date Posted: June 25, 2009 at 8:28 PM
i am an idiot wrote:
30 to your existing siren 87A to the alarm's siren wire. 87 to constant or switched 12 volts. 85 to ground. Just for you Howie. 86 to your play button switch. other side of switch to power. When the relay is not energized by your button, the voltage from the alarm is allowed to pass from 87A to 30 to get to your siren. When you press the button, the relay will energize and supply power to pin 30 which will power your siren. Injecting 12 volts into an alarm's siren wire SHOULD not damage an alarm brain. Notice I said should not.
Thanks again! I'll rewire it tonight and test it tomorrow. I'll let you guys know how it turns out.
Posted By: uluahunter
Date Posted: June 25, 2009 at 9:55 PM
Hey guys, had a moment to rewire and test the setup again. It still didn't work with the relay...maybe a faulty relay? Anyway, while I was at it, I disconnected everything and tried it without the relay. I wired it like a series...pos from play button to constant 12v+ source (car battery), pos from siren to neg on play button, neg on siren to ground or neg on battery. It worked just like I wanted it to. Since the siren doesn't draw much amps, I didn't run a fuse. I knew that I should've tried this from the start, but I assumed that I would need a relay for some reason. I have a tendency sometimes to make things more complicated that it really is. Thanks again for your advice!
Posted By: i am an idiot
Date Posted: June 27, 2009 at 8:10 PM
A small wire needs a fuse just as much as a large wire needs one. It just needs a smaller rated fuse. A 5 amp fuse should be fine in your case. But you really do need to have one.
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