circuit cut off

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=122315
Printed Date: April 24, 2024 at 8:16 PM

Topic: circuit cut off

Posted By: tabaccoy2k
Subject: circuit cut off
Date Posted: June 15, 2010 at 11:26 PM

Hello all,
I saw in the car of a friend installed a circuit current cut off of 12 volts and you cannot turn on your car but and this circuit is activated by touch.
You just have to touch where you hid the two tiny points of activation and the circuit is reset giving the 12 volts to re-start your car.
I wonder if someone on this board knows anything about this or have information you would like to share.
To which I thank you very much and would like to build it and then install it on my carts.
I saw the circuit and this is how I look. Hope this helps.

Thanks again

Tabaccoy2k :)

posted_image

Replies:

Posted By: oldspark
Date Posted: June 16, 2010 at 3:55 AM

So a fly lands and the circuit starts an already started vehicle?
Or kills it?

And that's what you want?

Posted By: howie ll
Date Posted: June 16, 2010 at 4:56 PM

One needs the capacitance to understand this, another great idea from about 12 years ago consigned to the dustbin of history, let's face it, if I'm in YOUR car that baby is going to be up and running no matter what brand or type of aftermarket immobiliser is installed.

Posted By: tabaccoy2k
Date Posted: June 16, 2010 at 5:31 PM

Basically this normally open starter kill relay.
It is very similar to those that are here, but with the difference of the circuit "Z" only touching the hidden points.
30 and 87 is closed and you can start it.
The circuit is here you have to use a button or an external signal.
What I'm looking for is if anyone knows how to make this circuit “Z”.
I think it is safer and practical to activate.

Thanks again

Tabaccoy2k posted_image

Posted By: catback
Date Posted: June 19, 2010 at 7:52 PM

howie ll wrote:

let's face it, if I'm in YOUR car that baby is going to be up and running no matter what brand or type of aftermarket immobiliser is installed.

You sound pretty confident there. I'm sure my ride will humble you, it already has humbled a thief.

Posted By: oldspark
Date Posted: June 19, 2010 at 8:41 PM

In terms of starter kill - ie, a circuit that breaks the starter motor signal - I can almost guarantee their uselessness.
There are very few cars where that cannot be overridden with a screwdriver or coin. Some others need a bit of bent metal.

But that is different to ignition & EMS etc immobilisation. (Big difference between OPENING a circuit as opposed to other defeating mechanisms. And in older cars (pre-CAN & pre-chip), opening of circuits is VERY easy to defeat!)

Posted By: mikvot
Date Posted: June 19, 2010 at 10:12 PM

I'm in your car right now catback.....what is this air freshener you are using? jeez

Posted By: howie ll
Date Posted: June 20, 2010 at 2:04 AM

Catback, maybe I should explain, in the winter I do lots of call-outs,
" the alarm/immobiliser has failed, I can't start the car ".
Well we all know what's going on here so once I remove said unit and have earned my fee in goes the "bye the way, please change your battery, it's knackered" routine. The point is I don't have to break in, I'm given a key and I go to work, hence the 10 minutes.

Posted By: catback
Date Posted: June 20, 2010 at 7:06 PM

oldspark wrote:

In terms of starter kill - ie, a circuit that breaks the starter motor signal - I can almost guarantee their uselessness.
There are very few cars where that cannot be overridden with a screwdriver or coin. Some others need a bit of bent metal.

But that is different to ignition & EMS etc immobilisation. (Big difference between OPENING a circuit as opposed to other defeating mechanisms. And in older cars (pre-CAN & pre-chip), opening of circuits is VERY easy to defeat!)

Yes the older cars that didn't have much for electronics were very easy to get around electrical kill circuits. That's why anti-theft devices were mechanical back then.

mikvot wrote:

I'm in your car right now catback.....what is this air freshener you are using? jeez

You may be in it but I notice your not going anywhere posted_image

Posted By: oldspark
Date Posted: June 20, 2010 at 10:53 PM

catback wrote:

Yes the older cars that didn't have much for electronics were very easy to get around electrical kill circuits.

In terms of modern open-circuiting, nothing has changed - hence why starter disabling is useless (except for joy riders).

Disabling is different. But disconnecting or open circuiting isn't.
As long as that point is understood....