Alarm (-) output to 3 relays

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=41289
Printed Date: May 13, 2025 at 4:22 AM

Topic: Alarm (-) output to 3 relays

Posted By: sm951
Subject: Alarm (-) output to 3 relays
Date Posted: October 20, 2004 at 9:51 AM

Hi,

I'm thinking about using the single continuous negative output that my RKE emits, when armed, as the ground for the coils of 2 or 3 separate relays. Would I need any diodes or anything else across these 2 or 3 wires?

Thanks in advance,
sm

Replies:

Posted By: ampere
Date Posted: October 20, 2004 at 10:23 AM

As long as your grounds for your relays are not supplying a load (ie just triggering the relays) you should be fine.

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