using aux battery for alarm backup

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=128142
Printed Date: May 21, 2024 at 12:22 PM

Topic: using aux battery for alarm backup

Posted By: dennisr
Subject: using aux battery for alarm backup
Date Posted: August 04, 2011 at 9:57 PM

My truck has dual batteries, the aux is only used to run an invertor and I want to use that as a backup for my alarm. I have an isolator controled by a switch to seperate the batteries. Whats the best way to wire this up to still keep them seperate so one doesnt drain the other? If I place a diode in the alarm power wires from each battery would that be enough? I dont really know what size diode to use.

Replies:

Posted By: oldspark
Date Posted: August 04, 2011 at 10:13 PM

You need to transfer the alarm (power) to the aux battery.

Posted By: dennisr
Date Posted: August 05, 2011 at 1:52 PM

That might be a good idea. Definetly easier to do.

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