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Old Sep 5, 2019 | 08:57 AM
  #1  
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Default Anti Theft System

I'm thinking of attempting to revive my system. Was wondering who has journeyed down this path before me and what it took to succeed.

Has anyone documented their journey? If so can you post a link to the thread?

Thanks in advance.

I have a 76.

Last edited by DaGuvner; Sep 5, 2019 at 08:58 AM. Reason: omittid year.
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Old Sep 5, 2019 | 09:26 AM
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It's not that complicated of a system. Just a bunch of normally open switches that go to ground and energize a relay to sound a horn when the circuit is closed.
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Old Sep 5, 2019 | 10:17 AM
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Why bother? The only way to PREVENT theft or damage is for you to stay close enough to actually SEE your car, and to not take it anywhere 'risky'. Once you have a Corvette in nice condition, you cannot leave it unattended [or un-garaged] and protect it. Vandals, idiots, etc. fill this world and your car will draw those folks to it.

If no one is around protecting it, fools will do damage and then run away. That honking horn will do nothing to repair the damage. Don't waste your time and money on fixing a system that is basically useless......unless you are striving for a high-level NCRS award. For that, the system would have to function as intended.

Last edited by 7T1vette; Sep 5, 2019 at 10:18 AM.
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Old Sep 5, 2019 | 01:08 PM
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Lots of help here:
https://www.corvetteforum.com/forums...rchid=76783120
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Old Sep 5, 2019 | 01:32 PM
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I do use mine but not if I'm going to be away from the car for an extended period. The system needs a timeout or it will beep all day.
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Old Sep 5, 2019 | 02:33 PM
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I like to make everything on the car work, got nothing to do with the NCRS. It's just me. Plus I like to tinker which is why I bought a C3, always something needs tinkering.
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Old Sep 5, 2019 | 05:08 PM
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Originally Posted by Peterbuilt
I tried that link several times and it would only say "no matches".
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Old Sep 5, 2019 | 06:53 PM
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Originally Posted by C3_DH
I tried that link several times and it would only say "no matches".
Go to the 'SEARCH' tab above and click on 'click for advanced search'.
Type in 'Anti-theft'
Then pick 'C-3 from the drop-down menu and you'll find many posts.

If you have a specific question post back and someone will help with an answer.

Edit: type in 'anti-theft alarm system' for more results.

Last edited by Peterbuilt; Sep 5, 2019 at 08:56 PM.
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Old Sep 5, 2019 | 07:05 PM
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Hey, if you just love tinkering with the car, go for it!! It's a pretty simple system: plunger switches on doors and tops; the switches make 'ground' when something is opened, completing the circuit to power the horn. Key switch to activate it. Knock yourself out....
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Old Sep 5, 2019 | 08:43 PM
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Originally Posted by Duke94
It's not that complicated of a system. Just a bunch of normally open switches that go to ground and energize a relay to sound a horn when the circuit is closed.
I have a 75. This applies if the alarm switch is on the front driver fender. The switch on the fender has a backup switch that is activated if a crimanal rips out the switch on the fender. This backup switch looks a lot like the switches used to show the headlamps are up. It is a black plastic switch with a button that has a rubber seal around it. The button has to pressed up and touching the fender switch to complete the system. This button activates the system if the fender switch is pulled out. Make sure the black button is depressed all the way in when it is touching the fender switch.
The other problem may be the horn itself. it is located behind the driver rear tire. Not the best place as far as water or dust. Test the horn.

Let us know how you do.
Thanks Steve
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Old Sep 5, 2019 | 08:58 PM
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Here's the switch that Steve COSD mentioned.


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Old Sep 6, 2019 | 07:13 AM
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Thanks to all for the responses!!!
Yes, I do like to tinker and fix things especially here in northern IL. during our seemingly long winters.

Love the forum.
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Old Sep 6, 2019 | 12:30 PM
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Throwing away the alarm siren horn on my 75 was a guilty pleasure. Then I fished it out of the garbage and installed it inline with the normal horn up front.

As a still living highly active motorcyclist who bought his 1st streetbike in 1985 a good horn is key on any vehicle.

Last edited by Kie; Sep 6, 2019 at 12:30 PM.
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Old Sep 6, 2019 | 12:31 PM
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Send me your email and will send you a file on troubleshooting the system. The file is an Excel spreadsheet.

Roger
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Old Sep 6, 2019 | 05:58 PM
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I have a complete NOS system I bought years ago on Ebay. I'm still deciding to install it or not.
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