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Imagine how many watts the starter has (usually a couple of kilowatts). This is the capacity of the battery. A typical ancient lead-acid battery. And 1000A, she'll give you what the fuck to do at KZ. And then everything depends on the cross-section of the wires and the resistance of the diodes in the last moments of their lives.
In short, to burn these diodes (and along the way and half the equipment of the car) can be very easy. It is enough to confuse the polarity of the battery terminals.