multiple12v connections
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=37546
Printed Date: July 06, 2025 at 4:33 PM
Topic: multiple12v connections
Posted By: vbel
Subject: multiple12v connections
Date Posted: August 16, 2004 at 10:47 PM
On my alarm I have two 12v wires I have to connect, plus I might have a few more relays that will require a 12v wire. Can I just tap into the same 12v wire under the dash 3-5 times or will it cause problems? If I can, then I simply directly connect to it and I'm good to go?
Replies:
Posted By: switch_hitter
Date Posted: August 16, 2004 at 11:07 PM
you must be talking about the 12 volt constant, and the ignition....you can tap into 12 v constant, and ignition, but i would recommend using relays for anything after that...
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Posted By: auex
Date Posted: August 16, 2004 at 11:22 PM
It depends on how much current you will be drawing as to whether or not to tag power at the ignition harness. I would recommend that you tap main power for the alarm under the dash and if you require any more then 15 amps in addition to the alarm that you run a feed from the battery, fused of course.
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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
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I've been sick lately, sorry I won't be on much.
Posted By: vbel
Date Posted: August 16, 2004 at 11:23 PM
No, I need two 12v constant wires for my alarm. It is a Compustar. If I'll need relays for my installation, then of course I will need more 12v constant wires. I don't think you meant I'll need another relay before going to the actuall relay I'm trying to hook up, right? And I also putting a couple neon lights under the dash, so here goes another 12v constant tap in. I'm just wondering how everyone else does this kind of thing.
Posted By: vbel
Date Posted: August 16, 2004 at 11:27 PM
How much is 15 amps in real world words? :) I'm not too sure how it should be measured.
Posted By: auex
Date Posted: August 16, 2004 at 11:29 PM
What ever you need for the alarm tie into the ignition harness. For other accessories, such as your neons, run a wire from the battery, fused of course.
-------------
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.
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