alarm works without ground?
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=38291
Printed Date: July 27, 2025 at 9:30 AM
Topic: alarm works without ground?
Posted By: dlee337
Subject: alarm works without ground?
Date Posted: August 29, 2004 at 6:01 PM
i am installing a 690XV in my 90 Integra. as i tested everything last night, i noticed that the alarm was working when there was no ground applied to the system. there is a single ground wire running accross the dash for the system that has the hood mercury switch and siren on it only. it is not connected to ground. the battery backup is hooked to the power of the alarm, but the ground is not attached to anything yet. the ground for the alarm is not attached to anything either. when i apply power to the alarm, it works with no apparent ground. the only thing i can think of is somehow it is being grounded through the sensors. the siren works normally. the mercury switch triggers the alarm when the hood is open. any ideas why i have ground when there should be none?
Replies:
Posted By: auex
Date Posted: August 29, 2004 at 7:31 PM
This is normal. The alarm will try to ground through some of the wires such as ignition or lights. The alarm will not work properly most of the time when it is trying to ground this way.
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Certified Security Specialist
Always check info with a digital multimeter.
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Posted By: JWorm
Date Posted: August 29, 2004 at 11:12 PM
Try using the alarm with the key turned on. It probably won't function.
Posted By: dlee337
Date Posted: August 30, 2004 at 11:55 AM
when the alarm is armed and i try to start the car, it works normally. the siren sounds and the starter won't engage. i get the "IGN" signal on the remote. it seems to work just fine. theonly thing is the ground wire is laying on the floor. i plan on connecting the ground wires anyway. just wanted to make sure i wasn't going crazy or anything.
Posted By: Teamrf
Date Posted: August 30, 2004 at 4:45 PM
Usually the alarm will try to ground through the siren. It will sound very low and funny. ------------- ~The Rookie~
Rookie of the year that is...
Don't let the smoke out of your equiptment..it doesn't go back in.
Posted By: dlee337
Date Posted: August 30, 2004 at 5:03 PM
when i plugged the fuse in at the battery, i got a real low, muffled double chirp. when i test the alarm, the siren sounds full blast, as my wife can attest to. everything seems to work normally and the car still works, so i am going to run with it.
Posted By: auex
Date Posted: August 30, 2004 at 6:03 PM
You need to ground the alarm, period.
-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Posted By: sroth140
Date Posted: August 31, 2004 at 10:01 AM
ground the alarm or it could damage whatever its grounding through. just because you are being stupid about it and not using a chasis ground, i hope it takes out your BCM or ECU, whatever your vehicles have thats costs the most. it'd be funny to damage a $1000 part over a ring terminal and a screw, ass.
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MECP certified installer
Posted By: dlee337
Date Posted: August 31, 2004 at 10:43 AM
sroth140 wrote:
ground the alarm or it could damage whatever its grounding through. just because you are being stupid about it and not using a chasis ground, i hope it takes out your BCM or ECU, whatever your vehicles have thats costs the most. it'd be funny to damage a $1000 part over a ring terminal and a screw, ass.
dlee337 wrote:
i plan on connecting the ground wires anyway.
maybe you should learn how to read, sh*thead. i am well aware of the need to ground the system.
Posted By: heavilymedicate
Date Posted: August 31, 2004 at 11:33 AM
pppppffttt! No need to get nasty, just ground the damn thing and kill this thread.
Posted By: slipkx2
Date Posted: September 01, 2004 at 1:12 PM
ground it anyhow its not good to leave alarms ungrounded or any device for that matter
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