diode for back up battery?

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=112335
Printed Date: June 01, 2024 at 10:39 AM

Topic: diode for back up battery?

Posted By: ps2wiz
Subject: diode for back up battery?
Date Posted: March 13, 2009 at 8:41 PM

I have a Compustar alarm that has a seperate input for a back up battery, I used a larger size 12V house alarm battery. But that is besides the point, I connected my main battery to this back up battery. And, my main battery has been getting drained if my car sits for about 4-5 days without being started. This is where my question is: Should I diobe isolate my back up battery? If so, what kind of a diode?

Thanks

Replies:

Posted By: dualsport
Date Posted: March 14, 2009 at 10:49 AM

Are you saying your backup battery is draining your main battery? If you leave your backup battery unconnected, does it read a normal voltage above 12.7V?

Or are you more concerned with having your alarm work even if the car won't start?

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