dei 502t, battery backup, will it work?
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=103204
Printed Date: June 15, 2024 at 7:54 AM
Topic: dei 502t, battery backup, will it work?
Posted By: nightides
Subject: dei 502t, battery backup, will it work?
Date Posted: March 19, 2008 at 1:19 AM
Am using the 520t as a backup for a GPS tracking device if main battery is disconnected. I know it will work as it should if the '+' battery cable is removed but what if the grounding wire is disconnected..?? Will it still kick in as well at that point of not..?? Thanks for the help.
Replies:
Posted By: spookiestylez
Date Posted: March 19, 2008 at 10:22 AM
yes, it will work the same way no matter what terminal of the battery is disconnected until the the battery dies on the 520T.Cheers
sS
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RTFM
Posted By: nightides
Date Posted: March 19, 2008 at 9:06 PM
spookiestylez wrote:
yes, it will work the same way no matter what terminal of the battery is disconnected until the the battery dies on the 520T.Cheers
sS
Thanks for your answer. I am grounding the Dei520i and the Gps unit to the main battery '-' terminal (twisted both wires together then connected them to the main battery w/ a loop connector) and not to the 'chassis ground' as indicated in the instructions. Once the negative of the main is disconnected, my GPS switches it's ground to the backup battery instead.. This how it seems to work when I tested it w/ a voltmeter. Does this sound correct to you or am I missing the big picture here?? Thanks again for the help.
Posted By: skee-weezy
Date Posted: March 19, 2008 at 9:10 PM
ground your gps and back up to chassis ground.... most good thiefs know that disconnecting ground is the easiest way to shut all systems down... if your back up has it's own ground... it will pull power more effectively with less resistence... the last thing u want any 12 volt component to do is to have to search for a ground because the primary has been disconnected.... otherwise.. what u are doin is fine.. but i would ground it separate from the battery if it was my car...... ------------- there can be only one.......
Posted By: spookiestylez
Date Posted: March 19, 2008 at 9:21 PM
^^, yeah, what he said. I didn't realize that you didn't have the components grounded to the chassis, If you have them hooked up to the battery ground, when/if the battery ground is removed you would lose power to both. Find a somewhere( like a kick panel) that you can remove some paint from to get a clean metal surface to drill in your own ground, or grab onto and existing ground ( should be something in the kick panels). That way you have a ground, and when either of the batteries terminals are removed you still have power from the 502T, and their own ground.Cheers
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RTFM
Posted By: nightides
Date Posted: March 20, 2008 at 1:38 AM
First up this GPS unit is going in a boat made out of fiberglass. Sorry for not explaining this before hand. Secondly, If the Dei520t is grounded to the chassis ( if this was a car...) and the GPS is also grounded the the chassis as per it's instructions, the GPS would work because it was indirectly picking up the ground connection of the Dei520t. through the chassis.?? Am I all wet on this..?? The cicuit just needs to be complete.. Was initially thinking of wiring both the main and the backup batteries in parallel so in the event of the main being taken out, the GPS would pickup the 12v '+' and '-' from the backup. I do appreciate all the helpful advise.
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