negative relay, lock, unlock
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=107091
Printed Date: May 14, 2024 at 9:31 PM
Topic: negative relay, lock, unlock
Posted By: 12vlost
Subject: negative relay, lock, unlock
Date Posted: August 28, 2008 at 1:31 PM
Hi, need a little help in a relay problem. I have fitted two extra deadlocks to my Dodge Sprinter van which require negative feeds on each side of the MES relay to lock/unlock. I have searched for the wire colors and have tested a few in the rear cabin but no joy.I have fitted a Cobra alarm which does give a negative feed when armed,this is great for the locking of the extra locks and its independant of the factory central locking so in my mind is more secure.Trouble is, I need a seperate negative feed when disarmed/unlocked to the extra dealocks. I'm thinking, is it possible to wire a relay so I can feed it a negative signal and when the negative signal (from the alarm) is removed it gives a seperate negative feed to unlock? TIA
Replies:
Posted By: KPierson
Date Posted: August 28, 2008 at 1:49 PM
Why don't you use the (-) unlock output of the alarm or the (-) factory alarm disarm output?
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Kevin Pierson
Posted By: 12vlost
Date Posted: August 28, 2008 at 2:19 PM
Thanks for the reply...reason is,theres none!! Its a can-bus alarm so it connects can high/lo to the wiring,theres only a steady - output on the alarm when armed,its then dormant when disarmed hence the need for a schematic.
Posted By: KPierson
Date Posted: August 28, 2008 at 2:50 PM
How about hooking a relay to the unlock actuator of the front doors? Pin 85 - +Unlock
Pin 86 - ground
Pin 30 - ground
Pin 87 - (-) output to added deadbolts. Now, everytime the doors unlock a pulse will be sent to the added deadbolts. ------------- Kevin Pierson
Posted By: 12vlost
Date Posted: August 28, 2008 at 3:10 PM
Reverse polarity? Good idea ,thanks.That puts it back on the central locking circuit and could compromise security for the rear of the van if the locks are popped. Also,finding a positive pulse on unlock may be tricky as these vehicles hate cutting into the electrics. I found this https://www.the12volt.com/installbay/forum_posts.asp?tid=95063 I tapped into the yellow/white wire and it doesn't give a - output.
Posted By: 12vlost
Date Posted: August 29, 2008 at 4:25 AM
[QUOTE=KPierson] How about hooking a relay to the unlock actuator of the front doors? Pin 85 - +Unlock
Pin 86 - ground
Pin 30 - ground
Pin 87 - (-) output to added deadbolts. Now, everytime the doors unlock a pulse will be sent to the added deadbolts. [QUOTE] Thanks Kevin, I actually found a blue/black wire on the harness right where I needed it which gave 12v+ on unlock,wired it as you suggested and its perfect.One of the reasons I donated to this site as its members are so helpful :-) On a side note, I have an ignition trigger wire which is low gauge and I want to use this to power several relays,is there a max draw for the trigger wire or would it be wise to connect the trigger wire to a relay to give me multiple trigger wires? I was thinking of this 85- ground 86- ACC wire ign on 87- out to trigger wires 30- constant power 87a- No connection
Posted By: 12vlost
Date Posted: September 02, 2008 at 6:17 AM
Anyone please? Could really do with a suggestion on wiring a relay that gives a negative output when a negative is removed,its too easy to pop a window the way its wired now and press the unlock switch on the dash. TIA
Posted By: megaman
Date Posted: September 02, 2008 at 9:27 AM
wouldn't your shock sensor go off if they popped the window?
Posted By: 12vlost
Date Posted: September 03, 2008 at 11:13 AM
It would yeah,sadly these days no-one cares and they'd empty the rear ,quick as you like.
Posted By: 12vlost
Date Posted: September 06, 2008 at 12:05 PM
Can it not be done? Thanks
Posted By: KPierson
Date Posted: September 06, 2008 at 1:17 PM
Looks like you might need a more flexible alarm system.
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Kevin Pierson
Posted By: dualsport
Date Posted: October 08, 2008 at 10:02 PM
12vlost wrote:
Anyone please?
Could really do with a suggestion on wiring a relay that gives a negative output when a negative is removed,its too easy to pop a window the way its wired now and press the unlock switch on the dash.
TIA
What kind of current are you looking for on the negative output?
If a half amp will do, all you probably need is a transistor like a BS170 or 2N2700. If you connect the gate pin to your switched line, then it'll connect your output to ground whenever the voltage rises above 4V. You just have to check the switched signal to see that it switches between ground and some positive voltage. It's voltage controlled, so it won't draw any power from your switched signal.
If you switched signal has voltage spikes on it, you'll want to add some protective circuitry to keep from damaging the transistor.
Posted By: ckeeler
Date Posted: October 09, 2008 at 5:51 PM
use a DEI 528T. it is a relay with an adjustable timer on it for the output which you can make positive or negative, which ever you choose. it can be activated with a negative pulse, OR (what your looking for), actvated when it sees a negative removed. cool huh?
Posted By: 12vlost
Date Posted: October 13, 2008 at 4:14 PM
ckeeler wrote:
use a DEI 528T. it is a relay with an adjustable timer on it for the output which you can make positive or negative, which ever you choose. it can be activated with a negative pulse, OR (what your looking for), actvated when it sees a negative removed. cool huh?
Very cool thanks for both suggestions,will try them and report back..............
Posted By: 12vlost
Date Posted: October 28, 2008 at 4:55 PM
I bought a DEI 528T and need a shematic to give me a - trigger when - is removed,any ideas please as the instructions are a little vague?
Posted By: ckeeler
Date Posted: October 28, 2008 at 5:02 PM
let me read this whole thread over again. i sorta forgot what unit you had.
Posted By: ckeeler
Date Posted: October 28, 2008 at 5:12 PM
12vlost wrote:
Hi, need a little help in a relay problem. I have fitted two extra deadlocks to my Dodge Sprinter van which require negative feeds on each side of the MES relay to lock/unlock. I have searched for the wire colors and have tested a few in the rear cabin but no joy.I have fitted a Cobra alarm which does give a negative feed when armed,this is great for the locking of the extra locks and its independant of the factory central locking so in my mind is more secure.Trouble is, I need a seperate negative feed when disarmed/unlocked to the extra dealocks. I'm thinking, is it possible to wire a relay so I can feed it a negative signal and when the negative signal (from the alarm) is removed it gives a seperate negative feed to unlock? TIA
connect the black wire to ground, red wire to constant 12v, connect the yellow wire to ground, the brown wire will be your output. connect the BLACK/ white wire to the wire that shows ground when armed on your Cobra. when it goes away after disarming it will activate the 528T. use the adjustment screw to adjust how long you want the output to be. just a secound or two or all the way up to 45 i believe. you have to cut the blue loop also
Posted By: 12vlost
Date Posted: October 29, 2008 at 12:19 PM
Many many thanks for taking the time to help out, will wire it up and report back,thankyou....
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