Introduction
Owning a classic often means years of passion, restoration, hunting for parts and weekends spent tinkering under the bonnet. Losing all that in one night to an opportunist who slipped into the garage during the Salon de Wavre or while you were on holiday is a scenario nobody wants to live through. And yet thefts of collector vehicles have risen markedly in recent years, in Belgium and across Europe.
Thieves' logic is often simple: a classic with no alarm can be loaded onto a flatbed tow truck in two minutes, or hot-wired by hand with the first wires that come to hand. To counter this, you don't need to spend a fortune. Here is what really works for less than 35 euros.
Why classic cars are particularly targeted
The answer is fairly direct: they are easy to steal and very easy to sell on, in parts or whole, often for export. A classic car generally has no electronic immobiliser, no encrypted key ignition, no black box. Wiring the starter motor directly, a technique known to any self-respecting thief, is enough in most cases.
On top of that, the value of these vehicles is often underestimated on paper but very well known to fencing networks. A well-preserved Volkswagen Beetle or a restored 2CV can leave for foreign markets within a few days, dismantled or not. And once it has crossed the border, finding your classic again becomes virtually impossible.
⚠️ An important point before you start: some Belgian insurers require at least two anti-theft systems to cover a collector vehicle against theft. Check your policy and keep proof of purchase for your devices. A few photos are often enough. If your car is stolen and these conditions were not met, compensation may be refused.
Tips for less than 35 euros
1. The knob-type battery disconnect: 5 to 8 euros
This is the simplest protection there is. It fits directly on the battery's negative terminal, and you just loosen the small knob slightly to cut the whole electrical circuit. With no power, the car cannot start. The big advantage for a classic: it requires no changes to the wiring. You can easily find one at Delrue or at any car parts shop, and there are versions for the 6V batteries of pre-1960s cars. Its only drawback: if the thief opens the bonnet, he can see it and easily switch it back on. That is why it is best combined with a second protection.
2. The hidden key-operated battery isolator: 8 to 15 euros
Same principle as the previous one, but with a small red plastic key that you turn to open or close the circuit. The advantage is that you can fit it anywhere in the cabin or under the bodywork, in a spot only you know. Without the key, and without knowing where to look, a thief in a hurry will soon give up. It is discreet, inexpensive and suited to the simple electrics of period cars. Ideally, install it where the wires will not be visible as soon as someone opens the bonnet.
3. Removing the rotor arm: 0 euros
This trick is as old as cars with contact-breaker ignition, and it remains remarkably effective. When you leave your classic standing for several days or weeks, simply remove the rotor arm from the distributor and take it with you. The starter will turn normally and all the wires are in place, but the engine will never fire. A thief who does not know this mechanism will look for blown fuses or an electrical fault without ever finding anything. And even if he guesses, he would need a rotor arm that exactly matches your model. He won't have one in his pocket. Drawback: it is not practical for everyday use. It is more a protection for winter storage or long periods off the road.
4. The steering wheel lock: 10 to 25 euros
It is not the most high-tech solution, but it is one of the most visually dissuasive. A yellow or red bar locking the steering wheel can be seen from a distance, and that is often enough to send the opportunist thief on to the car next door. Check carefully that it fits the diameter and size of your period steering wheel: some old steering wheels are larger than today's standard. Some models also lock the steering wheel to the pedals, which is particularly effective. Fitting and removing it takes 30 seconds, so it is perfectly usable every time you take the car out.
5. The homemade coded cut-off switch: under 10 euros
If you are comfortable with electrics and mechanics, this trick is particularly fun and effective. The idea is to interrupt the ignition circuit or the coil supply with a small standard switch, hidden in an unexpected place: behind a trim panel, under a seat, in the glovebox. If you are feeling creative, you can even set up a combination of two or three innocuous-looking switches that must be operated in the right order before the car will start. A thief who does not know the “code” will be stuck, even if he gets under the bonnet. Always draw a diagram of this wiring so you remember it and can fix things if needed.
What costs more than 35 euros but is worth considering
The solutions above are very effective against opportunist thieves. For a classic worth several thousand euros, it is worth adding a GPS tracker. You can find compact units that work with a simple prepaid SIM card from around thirty euros, with subscriptions at 2 or 3 euros a month. If the car is stolen, you can share its real-time location with the police via your smartphone. It is the only solution that helps you get your car back once it has gone.
If your classic is kept in a private garage, a few motion detectors with SMS alerts cost around a hundred euros. They have the advantage of working even if the thieves cut the power, since they run on batteries and the GSM network.
Quick summary
| Protection | Indicative price | Type | Use |
|---|---|---|---|
| Knob battery disconnect | €5 to €8 | Mechanical | Daily use or winter storage |
| Hidden key cut-off switch | €8 to €15 | Mechanical | Daily use |
| Rotor arm removed | €0 | Mechanical | Long-term storage |
| Steering wheel lock | €10 to €25 | Visual + mechanical | Daily use |
| Hidden DIY switch | Under €10 | Electrical | Daily use |
✅ The key principle: no protection is 100% foolproof, but combining two or three of them is enough to deter almost all opportunist thieves. A thief who wastes too much time on your car will simply move on to the next one.
And what about insurance?
In Belgium, insuring a collector vehicle or a “vintage” car (generally over 25 years old) follows specific rules. Many insurers offer dedicated policies at a reduced cost, often with an annual mileage limit. But be careful: if your comprehensive (omnium) policy requires specific anti-theft devices and you cannot prove they were present at the time of the theft, compensation may be reduced or refused.
Always keep the receipts for the devices you have installed and, if possible, a few photos of them fitted to the vehicle. It takes little effort, and it can save you some very unpleasant discussions with your insurer on the day you need them most.
FAQ
Yes, much easier. Modern cars are fitted with electronic immobilisers and encrypted ignition systems that make stealing them without a key very difficult. A classic car, on the other hand, can often be started by connecting two wires directly to the starter motor. That is why simple mechanical protections, such as a cut-off switch or removing the rotor arm, have a much greater effect on a classic than on a recent vehicle.
Yes. Most battery disconnects sold for classic cars are compatible with 6V, 12V and 24V. Just check the label on the packaging before you buy. Specialist suppliers such as Delrue stock these parts for pre-1960s cars that still run on 6 volts.
It depends entirely on the terms of your policy. Some Belgian insurers explicitly require two separate anti-theft systems for collector vehicles. Read the general terms and conditions of your comprehensive (omnium) policy carefully, or contact your broker to clarify this point. If in doubt, combining two inexpensive protections (a steering wheel lock and a cut-off switch, for example) keeps you compliant and costs you less than 30 euros.