Maximum amperage draw of an engine ECU, please?

[sebage]

As I do not recommend the diode mounted in series, due to the voltage drop at the junction of the diode and the heat dissipated, I offered a better option, in my opinion (Case A).
At the same time (through the picture with Case A and Case B, drawn by me), I wanted to make sure that I understood well the circuit used by our colleague, in order to answer the question about the parameters necessary for the mounted diode.
I attach two more variants, valid only for fixed voltages (12V) (also drawn by me, don't laugh ), very good for protection against reverse polarization. Case C with two relays, automatically provides the correct polarity at the output, regardless of the polarity on the input. Case D with a single relay, does not supply voltage at the output, unless the polarity is correct on the input.


P.S. the installation presented on the wiki is only overvoltage protection