battery backup 520t issues

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=118939
Printed Date: July 05, 2025 at 4:56 PM

Topic: battery backup 520t issues

Posted By: dirtmaster
Subject: battery backup 520t issues
Date Posted: December 29, 2009 at 10:47 PM

Ive just installed the battery back up and when disconnecting the main car battery the alarm doesn't trigger but when i reconnect the battery the alarm is triggered.

Also another note is i have a Capacitor which i think is causing the issue. If so whats a way around it?

Here is how its installed
gray wire > brain 12v
black > constant ground
red wire > constant 12v
blue wire > trigger

Replies:

Posted By: dirtmaster
Date Posted: December 29, 2009 at 10:50 PM

Also i was wondering about changing the sealed battery because of issues of its capacity.

Here is the battery im looking at replacing it with.

Posted By: jcs091570
Date Posted: January 05, 2010 at 1:26 AM

Your connections are correct. The capacitor should have no affect. If you have a volt meter, double check the battery backup pack to make sure it shows at least 12 volts. If you have a -hood pin switch connected to the same -blue input, it will not activate the alarm when the hood is open you activate the alarm. Try holding down your pin switch and arming the alarm...then disconnect the battery. It should then activate. If you arm the alarm with the hood open it will bypass that -input zone if the 520t is also connected to it. So give it a try and let me know.