Brother you chose to ignore the rest of my post and picked just one point which is exactly what I said (cars of 60s and 70s) FX doesn't count as it is an 80s car
Now let me break my post down for you:
1- Those old cars had carburetors and dc generators.
2- Liana has an alternator instead of a generator and a voltage stabilizer and an ECU.
3- The ECU will shut the engine when it senses no battery.
4- If it doesn't, the spikes from your alternator will fry not only your ecu and/or other electricals, but also the diodes in your alternator.
Here's a link for reference: Don't Disconnect the Battery with the Engine Running
It is brave of you to this as I would never do this to my Liana knowingly! Let's see it this way. 3 people have survived the Niagra falls in modern history; it doesn't mean you should jump too
It IS science and these cars are designed by engineers.