diode for back up battery?

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ps2wiz

Member - Posts: 1

Joined: November 08, 2008

Posted: March 13, 2009 at 8:41 PM / IP Logged

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

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: March 14, 2009 at 10:49 AM / IP Logged

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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diode for back up battery?

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