DEI accessory

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=65568
Printed Date: May 03, 2025 at 10:03 PM

Topic: DEI accessory

Posted By: Black Dak
Subject: DEI accessory
Date Posted: November 03, 2005 at 8:26 PM

I purchased the 520T Backup Battery for my Clifford alarm, but the wiring disgram has me confused.

Where it shows the harness from the 520T to the harness of the alarm, the diagram shows two boxes, but no indication of what they mean. I even stopped at my stereo shop and asked, they didn't know either. They had DEI fax instructions to us, but still no information.

Is it just a tap into the power wires for the alarm brain, should there be diodes or something there?

Also, I bought a 507T Tilt sensor. It descibes the three connections to be made, but I want to make sure I am thinking of the correct spots.

The first is +12V constant, that's easy.

The second is (-) ground-when-armed output. What is an example of a grounded-when-armed output?

The last is an instant trigger input of vehicle security system. Would I just tap into dome lights or something? That doesn't seem right, which is why I am asking!

Replies:

Posted By: dualsport
Date Posted: November 03, 2005 at 10:09 PM

On the tilt sensor:
Most alarms have a ground-when-armed output; all it does is provide a connection to ground when you arm the alarm, and open the connection when it's disarmed. That lets you control sensors and devices that you only want power on when armed.

If the alarm doesn't have that kind of output, you might try simply hooking it up to the ignition switch line through a diode (for isolation when the ignition is turned on). The current draw of the sensor is so low that the ignition circuit effectively acts as a ground. Only difference is that the sensor will be on whenever you turn off the ignition, rather than arming the alarm.

Don't hook the trigger input to the dome lights-
That'd damage the sensor, because it can't handle the current that would be delivered through the dome light circuit. Your alarm should have a (-) trigger input, so you just need to find out which one is suitable, and tie it to that.

Posted By: Black Dak
Date Posted: November 03, 2005 at 11:07 PM

Thanks. I'll go with that and post again if I run into any more questions.