Alarm wont switch relay.

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=63130
Printed Date: May 09, 2025 at 7:06 PM

Topic: Alarm wont switch relay.

Posted By: cypher09
Subject: Alarm wont switch relay.
Date Posted: September 23, 2005 at 4:45 AM

I'm trying to hook up remote boot release in my 1989 Mazda 626 (Australian). The alarm is a Mongoose M20, with a negative Channel 2 Output.

The boot release solenoid is wired in with a ground and the 12v wire leading to a relay in the cabin. The relay is wired according to this: https://www.the12volt.com/relays/page1.asp

With the alarm ch2 output on the relay, nothing will happen. With the relay disconnected, the alarm pulses -12v when a button on the remote is pressed. When the relay is grounded it closes and the boot release solenoid triggers.

My problem is that the alarm will not trigger the relay, almost as if the output of the alarm isnt powerful enough. I've tried two different relays and the alarm will not trigger either of them. I've got no idea what to do :(

Replies:

Posted By: cypher09
Date Posted: September 23, 2005 at 5:02 AM

Just to clarify, a boot release is the same as trunk/hatch release.

Posted By: joe_1
Date Posted: September 23, 2005 at 6:22 AM

yes a boot release is the same as trunk/hatch, are you sure that there are all good connections test 12v+ supply, does the car have a release as standard

Posted By: cypher09
Date Posted: September 23, 2005 at 6:54 AM

joe_1] wrote:

es a boot release is the same as trunk/hatch, are you sure that there are all good connections test 12v+ supply, does the car have a release as standard

Yes, all 12v and ground connections are secure and proper. The car didn't come with boot release as standard, but I've installed a solenoid and it works perfectly when connected to 12v and ground.

I've spoke to my alarm supplier and he has recommended that I return the control unit for a replacement, so I'll do that and report back.

Posted By: cypher09
Date Posted: September 23, 2005 at 10:42 PM

Got the alarm control unit swapped for a new one, boot release works fine now :)

Posted By: KPierson
Date Posted: September 23, 2005 at 10:52 PM

cypher09 wrote:

I'm trying to hook up remote boot release in my 1989 Mazda 626 (Australian). The alarm is a Mongoose M20, with a negative Channel 2 Output.
The boot release solenoid is wired in with a ground and the 12v wire leading to a relay in the cabin. The relay is wired according to this: https://www.the12volt.com/relays/page1.asp
With the alarm ch2 output on the relay, nothing will happen. With the relay disconnected, the alarm pulses -12v when a button on the remote is pressed. When the relay is grounded it closes and the boot release solenoid triggers.
My problem is that the alarm will not trigger the relay, almost as if the output of the alarm isnt powerful enough. I've tried two different relays and the alarm will not trigger either of them. I've got no idea what to do

Try using a reed relay. They will use a fraction of the current to turn on and off. This is assuming that your problem is current related.

You may also look into using a straight transistor to amplify your availible current. I would definately try the reed relay first!

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Kevin Pierson