dei 520t battery backup, viper 5900
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=105338
Printed Date: May 04, 2024 at 12:36 AM
Topic: dei 520t battery backup, viper 5900
Posted By: ralliart16
Subject: dei 520t battery backup, viper 5900
Date Posted: June 08, 2008 at 4:27 PM
I recently decided to add the DEI 520T battery backup to my VIPER 5900 SST alarm.
I connected it as follows:
RED: to the ignition harness constant 12V wire
BLACK: to a ground
BLUE: to the Primary harness blue wire. I am using the blue wire for the trunk trigger, so I spliced into it. So again there are now two negative triggers (trunk and battery) on this wire.
GREY: To alarm module 12V input.
So the battery backup works. If i trigger the alarm then disconnect the battery, the siren still sounds. HOWEVER, if I disconnect the battery with the system armed, it does NOT trigger the alarm. The blue wire is functional as If i manually ground it, the alarm is triggered.
Another question... it says not to use this battery power high current things like lights, etc. However, since the battery output is tied into the alarm input, and the alarm input is wired into the ign harness power wire... the battery provides power to the harness. So if the main battery is disconnected and the alarm sounds, wouldn't the backup battery also be powering the lights? (since the parking lights flash with the alarm trigger)
Replies:
Posted By: ralliart16
Date Posted: June 08, 2008 at 6:08 PM
Well I did some additional testing.
When I use a multimeter and measure the current on a regular output (negative) trigger wire, it measures current when the output is triggered.
However, if i measure the blue wire directly off of the 520T module, NO current is measured when the system is armed and battery disconnected.
I presume the backup battery module measures a voltage drop across the constant 12V wire and that triggers it? But now that I think about it, since the backup battery wire is constantly providing power to the constant 12V wire thru the alarm input wire, there will never be a voltage drop across the ignition harness constant 12V wire.
Posted By: JWorm
Date Posted: June 08, 2008 at 6:16 PM
Is the power wire of the 5900 that you connected to the grey wire of the 520t also connected to the constant wire in the ignition harness? Is is not supposed to be.
Posted By: ralliart16
Date Posted: June 08, 2008 at 7:25 PM
JWorm] wrote:
Is the power wire of the 5900 that you connected to the grey wire of the 520t also connected to the constant wire in the ignition harness? Is is not supposed to be.
Yes.
The 12V input to the 5900 module is connected to the red ignition harness constant 12V wire. The grey wire from the 520T is connected to the 12V input wire, hence indirectly connected to the ignition harness wire.
I don't see how you would not connect it to it?.. unless I find a different source for the alarm 12V input.
Posted By: JWorm
Date Posted: June 08, 2008 at 7:55 PM
The 12v input of the 5900 goes to the grey of the 520t. That's it. The rest of your connections are fine.
Posted By: ralliart16
Date Posted: June 08, 2008 at 8:06 PM
JWorm] wrote:
The 12v input of the 5900 goes to the grey of the 520t. That's it. The rest of your connections are fine.
oh LOL. I see now. I need to disconnect the 5900 power feed from the harness and have it solely connected to the grey wire.
Gothca.. THANKS!
Posted By: mechanix
Date Posted: June 09, 2008 at 1:21 AM
ralliart16 wrote:
JWorm] wrote:
The 12v input of the 5900 goes to the grey of the 520t. That's it. The rest of your connections are fine.
oh LOL. I see now. I need to disconnect the 5900 power feed from the harness and have it solely connected to the grey wire.
Gothca.. THANKS!
I'm a little confused. So the alarm is not connected to a 12V constant power source? The alarms 12v red wire only goes to the 520T gray wire?
Posted By: mrcllusb
Date Posted: June 09, 2008 at 8:20 AM
Yes that is correct Mechanix.The 520 works like this.If it loses constant 12v feed from vehicle(red wire),it instantly switches to the battery for power(gray wire) to power alarm module.
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"ole blake"
Posted By: audioinstaller3
Date Posted: August 22, 2008 at 3:11 PM
I'm about to install my 520T in my car, since my neighbors civic just got his rims jacked. They pulled out his window and opened the door, popped the hood, and just disconnected the battery..and no more siren. No one even heard it, so it must of been fast. So with my constant 12v red wire from my alarm. I cut it. Run the alarm side to the gray wire, and the other 12v end that I just cut to the red 12v 520t wire. Then the blue wire to my -blue trunk trigger wire. My alarm is a python 990 if any one was wondering. Also I want to add another shock sensor. Can I just splice one into all the same 4 wires from my other shock sensor..or do I just connect it to the green wire?
Posted By: one4waves
Date Posted: August 15, 2009 at 11:04 AM
Resurrecting this thread with a question. I have the multiplexed blue wire of the 564T connected to a dual zone radar sensor. If I want to add the 520T Blue wire to that trigger input, do I need diodes on both the radar sensor & the battery backup outputs? If so, do the diode's stripes face the security system module or reverse?
Posted By: t&t tech
Date Posted: August 15, 2009 at 5:12 PM
Firstly that blue wire from the 520t is an input not an output! Secondly, yes you would need to diode all the inputs that go to the 564t, bands facing towards the alarm. Thirdly you can't connect that blue wire from the 520t to the mutliplexed input in the manner you are describing, the blue wire will only recieve the trigger not send out. So you can connect it yes, but you would have to reverse the diode on the blue wire of the 520t, band facing away from the alarm.
Posted By: JWorm
Date Posted: August 15, 2009 at 5:15 PM
The above is wrong. The blue wire on the 520t is an output. It should output (-) when either power or ground is removed from the input side of the 520t.
Posted By: t&t tech
Date Posted: August 15, 2009 at 6:47 PM
Really! My bad! thanks for the correction there mr.J worm!
Posted By: one4waves
Date Posted: August 19, 2009 at 7:03 AM
t&t tech wrote:
Firstly that blue wire from the 520t is an input not an output! Secondly, yes you would need to diode all the inputs that go to the 564t, bands facing towards the alarm. Thirdly you can't connect that blue wire from the 520t to the mutliplexed input in the manner you are describing, the blue wire will only recieve the trigger not send out. So you can connect it yes, but you would have to reverse the diode on the blue wire of the 520t, band facing away from the alarm.
Thanks for the response. Yes both the 520T trigger wire and the 1st stage (warn away) & 2nd stage (full alarm) trigger wires of the 508D are outputs. But they are all neg. outputs, so all diodes used would have the cathode (banded) side facing away from the alarm, correct? Also (asked this before), I can not get a warn-away response from my 508D when the outer zone (1st stage) triggers, only the full alarm sequence. Is it possible that I should isolate the 2 wires from each other with their own separate diodes prior to attaching them to the trigger wire? Just curious. I have tried to adjust both zones as instructed and I just can't get a warn-away response.
Posted By: t&t tech
Date Posted: August 19, 2009 at 4:33 PM
You are correct about the direction of the diodes. Also the alarm you have has a shock sensor with a plug that has been pre- wired to accomadate an additonal sensor without need to diode isolate both wires, you have to plug the side of the shock sensor plug with the loop into the shock sensor and using the green wire from the other end of the plug that goes into the brain connect both green and blue wires here if this is the only sensor diodes wont be needed, if you have multiple sensors, you would need to diode isolate the inputs. Triggers longer than 0.8 seconds will trigger full alarm and shorter than 0.8 will trigger warn away.
Posted By: anonymous1
Date Posted: April 16, 2010 at 11:35 PM
t&t tech wrote:
Triggers longer than 0.8 seconds will trigger full alarm and shorter than 0.8 will trigger warn away.
Sorry to ressurect an old thread, but I just want a bit of clarification. With the 508D, is it possible to get an "shorter than .8" trigger? Would this be a matter of sensitivity or is there no way to adjust this?
Thx!
Posted By: t&t tech
Date Posted: April 17, 2010 at 5:12 PM
Yes! There are both warn away and full trigger outputs on the 508d, the blue and green wires! ------------- COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF.
PSALMS 37:5
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