on my '74 stingray it has a keyhole on the side of the car next to the word stingray and I have come to learn that this is the alarm.

Now my idea was this, in addition to a regular alarm that will go off if someone hits the car or breaks a window or something, is there a way that I could wire the key thing to where when I switch it on it disconnected the ignition so it could not be hot wired(not that I really know how that works)

 

Yes you can. You need a relay

Term 85 Ground
Term 86 to siren power wire/horn wire
Term 87A from ignition
Term 30 to starter

The relay should be placed inside the car where you will find the starter wire. Not sure what year your car is but the wire is either purple or yellow. Take a test light and this wire will have 12 volts only in the start position of the ignition switch.

This way when the alarm goes off it sends power to the relay and it activates, when the alarm turns off it deactivates the starter kill.

You want the relay to function when the alrm goes off not when the alarm is set. If the relay is active everytime you set the alarm the battery will only last for a few days because the relay is soaking up power.

 

Oh ok that makes sense I guess thats the way I will do it.

Thanks for the information

 

Stephen87,
I do not want to "rain" on your parade...but...eventhough IF you install this idea in your car...there are people out there that can still get your car to crank....and drive off. The electronics of your car are really basic...unlike the 84-96 Corvettes. To make your car really hard for someone to steal...it will take more than what you are thinking to stop someone with knowledge of the wiring of your car. This idea will work but you have to make it so they can not open your hood...at all. If the hood can be opened....the car can be hot-wired and be driven off. All you are doing is stopping the starter from working...which can be easily by-passed. And with the HEI distributor....getting power to it is a snap. Remember it takes three basic things that make an engine run....AIR, FUEL and SPARK. You can not remove air...that is a given. So you have to either stop the fuel and spark. With you having a mechanical fuel pump...instead of an electric fuel pump...once the car gets cranked...it running and off. Trying to stop the spark is hard also if the underhood is able to be accessed. You may slow them down a bit with your idea...but not for long.

Like I stated ...I didn't want to rain on your parade...but I wanted to let you know that this is not really going to stop anybody who REALLY wants it and knows what they are doing. Sorry for being a somewhat "KILLJOY".
"DUB"

 

Nothing wrong with your idea. A good thief can steal property regardless of the lengths you go to. But, such a 'lock-out' would prevent most of them from succeeding.

 

hmm...well since someone can still steal it and there is not an easy way to cut the spark and I can't stop the fuel pump I was thinking of finding a small electric valve to place inline with the fuel line so when I turn the key it closes the valve and cuts the fuel to the carb so if it does get started it it shut off rather quickly, how does that revision sound, it will also be in addition the ignition getting disconnected when the alarm goes off. and now off for a difficult part...finding the dang valve

and @ grandmastercorvette no need for apologies i could always use constructive criticism it allows me to figure something else out and on the way maybe new ideas

 

A fuel shut-off is a good idea! here's my alarm! PG.

 

nice I certainly wouldn't go near your vette...or home


so far this is what I have found

http://www.snydersantiqueauto.com/4008

http://www.rvparts.com/product-79-AFC11112

 

Glad you have a sense of humor. The RVParts shut off seems like the best one, tie that in with a concealed separate switch and you should be OK. At least if they drive off they will run out of fuel a few blocks away. As GM said there is no way to stop a pro as they can tow it away in a blink but with a little effort you can make it difficult to steal. PG.

 

Yea I know I cant stop the dedicated ones(same thing in the computer security area, with simple protective measure you can stop most people but the really dedicated ones are hard to stop), how ever I can stop most of the young hoodlums who just want a quick ride

 

Cutting off the starter certainly doesn't prevent hot wiring!

That may be pretty easy. First is try keeping them from going for your car. 1 An alarm w/ flashing LED or just a flashing LED.
2 It's common knowledge among thieves about breaking the st. column. I have had a SS armor on column for many years.

 

My previous post does not imply that's all you should do!

It is said that thieves do not like custom cars as they attract too much attention.


And if a thief wants to find out how to open a 68-82 Corvette hood all they have to do is get on a Corvette forum like this & ask how! Many will post all they know about it (e-mail is better). Fortunately few knew the secret. For years we deleted (I asked) the topics after the problem stuck hood was resolved.

A simple kill switch can work. If that's all, expect plenty of damage when they get in it even if they don't get the car.
T-Top locks are good too.

 

2 questions now where can I get ahold of that steering column armor and also the t-top locks

 

If someone wants to steal your car bad enough, they are going to get it. They will flat bed it. Alarms will make them think twice and go find an easier target, but if they want it they will get it.

Take a metal spike and drive it through the side of the car until it shorts out the battery or just cut the ground or positive cable from underneath.

Place square rims on it, make it very difficult to move.

Instead of fuel cuttoff I would disable ignition. Engine wil run until fuel bowl is empty and that can be quite a while.

A second relay used for killing 12volts to dist or adding ground to tach wire will shut it down quickly.

 

so I could add a relay to kill the distributor...where would I attach it.

 

Tach wire you add ground or use the relay to break 12 volts to dist.. If they get past the starter kill relay the car still won't start but it will crank.

 

I just remembered this old idea I did on my sisters Camaro. I used the cigarette lighter as a starter kill switch. When the light was pushed in starter would not crank when out starter worked fine and on one had any idea there was a starter kill. Not even the mechanics. She was not a smoker and did not use the lighter. You could do that to disable your dist. too.

 

that is actually a pretty genius idea and it would allow me to keep the interior looking as stock as possible, I might do that for the distributer and the key for the fuel or maybe vise versa

 

The fuel cut-off switch is a very good way to go. At least the car will be a short distance away..if they can get it started... and rev the engine a few times and the engine will die due to NO GAS. Install it and test it like you were stealing it and see how long it takes for the fuel to run out. There is quite a bit of fuel in the pump and it may take a little bit of time to starve it for fuel. I do not know if this cut-off switch will possibly damage the diaphram in the fuel pump due to trying to suck fuel from a supply that has been cut-off and creating a vacuum...and repturing the diaphram. Only testing will let you know. I know that you have a return line provision in the pump...and it has been a while since I have had one cut open to see how it "ticks". May be I am over thinking this for you.

Any ignition cut-off is once again your choice. It is helpful...to stop those "rat-bastards" who want your car for a joy-ride. But easily by-passed....still the same.

Jokingly look at it another way...let them get in...then when the door closes...with the car knowing that it is trying to be stolen via through the alarm...make it so the doors lock and can't be unlocked from inside and the windows wont go down... then have the stereo start playing some music that you know would just MAKE THEM HATE IT...and then the A/C system starts to blow air that has some really bad smell attached to it....something like rotten eggs. When you get back to your car ...they will be begging you to call the police. And you would also have the odor neutralizer to get the smell out of your car so you can drive it away. Just a humurous thought.

Possibly hiding a switch that can cut off the power (12v) to the starter. Where it can be controlled by another switch...much like the cigatette lighter..to ground the relay....that would kill ALL power to the car. NO POWER... not start. Just would need to find a switch that could handle the current load for cranking. And it could still have power coming from the battery to keep it alive while everything else is dead....by running a seperate wire from the positive side of the battery before the switch.

Just trying to get you to a solution that would make it hard for me to get your car....thats all.
"DUB"

 

The Corvette parts/accessory cos. sell T-Top locks. Got mine from MA.
Steering column SS armor http://www.ochterbeck.com/