Backup Battery Relay Sanity Check
Printed From: the12volt.comForum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=46967
Printed Date: May 14, 2025 at 10:49 AM
Topic: Backup Battery Relay Sanity Check
Posted By: ak96ss
Subject: Backup Battery Relay Sanity Check
Date Posted: January 05, 2005 at 11:03 AM
OK, I'm getting ready to install a backup battery in my 1991 318is for the Alpine SEC-8048 alarm system I put in. Will the set up below work to
Thoughts? Did I get this right? How large a diode should I use to protect the circuit that leads to the alarm's backup battery connection? I've got the parking lights isolated with a relay, so the backup battery should only be running the main unit and the siren.
Thanks!
John
- Isolate the backup battery to prevent draining it if I leave my lights on, and
- trigger the alarm when main power is cut.
Thoughts? Did I get this right? How large a diode should I use to protect the circuit that leads to the alarm's backup battery connection? I've got the parking lights isolated with a relay, so the backup battery should only be running the main unit and the siren.
Thanks!
John
Replies:
Posted By: promodeepcycle
Date Posted: January 11, 2005 at 5:11 PM
Posted By: ak96ss
Date Posted: January 11, 2005 at 5:17 PM