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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.
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.
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.
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
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.
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....
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.
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.