CAR FUMY UPON START UP MANUAL

The why part is very important because if you just want the car to not start, the ignition key/switch is the most obvious way and has been in use for a really long time. It depends on tech level of the car and how difficult for you want the system to be and WHY YOU WANT TO PREVENT THE CAR FROM STARTING. Once again, I'm assuming you are thinking of theft prevention. Don't forget that the car can always just be towed.

There are other ways but pretty much all of them would fall under these categories if you want to be able to control it electronically. May mess with modern electronics in the car itself possibly leading to damage. Does not work on really old cars that used generators instead of alternators. Easier to find than others (I'm assuming this is to prevent the car from being stolen). It is not uncommon for cars to have fuses larger than 100A for the main input. This would require a hefty relay or switch. Intercepting main power like you mentioned.Older cars relied on mechanical versions of these. Con: Only works on cars that use these sensors.Pro: The car will not start no matter what you do since the ECU will think the engine is not turning over and will not provide spark.Activated with a switch (relay) intercepting the signal wire coming back from the sensor. They may also be called a cam angle/position. A lot of times a car would only have one, angle or position. These sensors generally deal with crank angle/position.

CAR FUMY UPON START UP MANUAL

Con: The car can still be started if you find a way to turn over the engine (pushing the car in gear if it has a manual transmission).It prevents the starter from turning over the engine. This would generally be put before the starter relay itself. Put a switch (relay, etc.) in line with the starter control signal. Some are better than others in certain situations, and some only work on certain cars.

Car fumy upon start up