1 relay for trunk pop and parking lights?
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=18903
Printed Date: July 07, 2025 at 4:42 PM
Topic: 1 relay for trunk pop and parking lights?
Posted By: cpgoose
Subject: 1 relay for trunk pop and parking lights?
Date Posted: September 15, 2003 at 7:55 AM
Hi,
I added a trunk release solenoid in my car, and wired it up to my alarm's AUX channel. The relay is setup like this:
85 : (-) from alarm
86 : 12v+
30 : 12v+
87 : to trunk solenoid wire
What I would like to do is have the parking lights light up when I pop the trunk. Since the parking light wire is (+), can I tap pin 86's wire over to the parking light wire for a quick "blink" of the parking lights? ------------- Q: What's the best nation in the world?
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Replies:
Posted By: floaterr
Date Posted: September 15, 2003 at 8:22 AM
If you connect 86 to the parking lights they'll stay on constant and that sure ain't blinking. ;)
If you try and connect them to 87 then the trunk will pop (or the fuse will) everytime you turn on the lights.
Wire a 2nd relay exactly as your above one and just connect 87 to the lights. You can either split the 85 wire to both relays or tie 87 of the above relay to 86 of the "flash" relay.
Good Luck
Posted By: cpgoose
Date Posted: September 15, 2003 at 8:44 AM
Well, I think I said it kind of backwards. It's currently hooked up for the trunk release, and that works fine. I wanted to tap pin 87 from the relay (the 12v+ going to the trunk release), and connect the parking light wire. This way, when the trunk pops, the parking light will flash once. (Being that the relay is only activated as long as you hold the button on the remote).
By the way, I already have a relay connected to the parking lights for lock/unlock confirmation. ------------- Q: What's the best nation in the world?
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Posted By: cpgoose
Date Posted: September 15, 2003 at 8:55 AM
Better said with a picture :-)
(Gee, and my old alarm used to light the parking lights with everything you did.)
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Posted By: Velocity Motors
Date Posted: September 15, 2003 at 9:03 AM
Yes, that is the correct connections. I would still use another relay and isolate the 2 circuits from each other ( just in case ). It's only a 50 cent relay and it couldn't hurt to be cautious.
-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: the12volt
Date Posted: September 15, 2003 at 9:19 AM
With the diagram above, anytime your parking lights are on, your trunk will open. You'll need to isolate the parking lights from the trunk release with another relay. -------------  the12volt • Support the12volt.com
Posted By: cpgoose
Date Posted: September 15, 2003 at 9:25 AM
Like so?.........(for the meantime, I ran out of relays:)
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Posted By: floaterr
Date Posted: September 15, 2003 at 9:39 AM
Don't think you can find a diode that can handle that kind power. 
Posted By: cpgoose
Date Posted: September 15, 2003 at 9:43 AM
You beat me to the punch 12volt....but I guess this is still wrong. I didn't think having the parking lights on would do that....but I guess I thought wrong. Oh well. Thanks for the quick input everyone. ------------- Q: What's the best nation in the world?
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Posted By: cpgoose
Date Posted: September 15, 2003 at 11:02 AM
Can I throw another question on here? I'm assuming this will work in the same manner. I have a DEI 450t channel expander. The expander has a brown wire that goes right to the alarm siren's wire (no relay needed) that chirps the siren everytime you hit the aux button (so you know which channel you're using). It says if you don't have a siren, you can put the brown wire to a relay, and have it blink the parking lights. I would like to accomplish both, so do I just need 1 relay? Can I put the brown wire from the expander to the relay, and then attach both the parking lights and the siren to the relay?
Again, better explained with a picture:
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Posted By: securinu
Date Posted: September 15, 2003 at 8:06 PM
not only will the diode diagram not work cause the diodes wont handle the load they are also wired backwards. The way it is displayedit wont allow the trunk to pop or lights to blink at all.
-------------
Joe O'Byrne
Owner / Installer
Posted By: 10nesne1
Date Posted: September 15, 2003 at 8:11 PM
The 6 amp diode will handle the current draw for the above diagarm.
2nd Q. Yes, one relay and two 6 amp diodes will do the job.
Good luck
PS: diagram above has 2 diodes. The diodes are hook up backward. It will stop positive and need to turn it around.
Posted By: cpgoose
Date Posted: September 16, 2003 at 9:04 AM
10nesne1, are you referring to the last diagram I posted....the one for the siren chirp and the parking light flash?
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Posted By: 10nesne1
Date Posted: September 17, 2003 at 12:20 AM
1 relay for trunk pop and parking lights
The first diagarm you have the diodes wired backward. If you wired it backward and it will not work because Cathode blocks Positive and allowed Negative to pass. You will need to turn the diodes around because Anode allow Positive to pass.
One for the siren chirp and the parking light flash
The second diagarm you will have to hook it the same as the first diagarm.
Remember, you turn on the parking light and the siren will sound if you don't have two diodes to isolate it. Same goes to the trunk pop circuit above. The best reliable way is to use two relay to isolate it.
Good luck
Posted By: cpgoose
Date Posted: September 17, 2003 at 6:35 AM
Thanks 10nesne1! Ok, so if decide to use 1 relay, I need to use the 6amp diodes, correct?...since the current will be so strong. 6-amp diodes like these?
But if I decide to use a relay, instead, then I don't need to use the diodes. I can just use the activation wire from the alarm or 450t to trigger both relays? ------------- Q: What's the best nation in the world?
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Posted By: 10nesne1
Date Posted: September 17, 2003 at 8:50 AM
That's correct. If the diode cost $2.49 each at your local Radio Shock, but most relay cost less than $3.00. I think you should use 2 relays, is it?
Good luck.
Posted By: floaterr
Date Posted: September 17, 2003 at 9:05 AM
1) I'd be curious on how hot those diodes got wth 6amps running through them (it would only be a flash so not really an issue. Just wondering)
2) I've know lighting systems to blow 10 amp fuses in humid weather. Not to mention if he goes to put a little uhaul trailer on it. (not likely but possible)
3) You would have now installed a fusable link which would handle less current then the fuse protecting the circuit. When (if) it pops it'll be under the dash and more then likely will generate heat and risk fire plus the fact that you would not be able to just pull it out and plug a new one should this happen on the road.
Last but not least you keep looking to get radio shack parts in attempt to do the install cheap but are doubling the price and introducing failure points.
This $.089 relay will work and stand up to the current load.
diode isolation should only be used on non load applications (triggers, etc..)..
Walmart sells the relay in auto department but for $2+. radioshack carries one that looks right but is in fact the wrong kind. Autozone might also carry it. I'd reccommend just going to local alarm shop and asking to buy X numbr of relays. Give them as little details as possible or they'll try and talk you into other crap and services you don't need. Print out the parts express page so they will haggle the price.
Posted By: cpgoose
Date Posted: September 17, 2003 at 9:31 AM
floaterr wrote:
When (if) it pops it'll be under the dash and more then likely will generate heat and risk fire plus the fact...
AGH! Don't say fire! 
Yea, I ordered 10 relays and 10 relay harnesses from bulldog security. I think it came to $25 total, so that wasn't too bad. I guess I'll be installing two relays for the siren and light flash for the 450t, and I guess I'll do the same for the trunk and parking light aspect. (And I won't install any 6A diodes).
Thanks for the help...I really appreciate it.  ------------- Q: What's the best nation in the world?
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