Originally Posted by hanzbrady

If you spin something faster that generates power based on RPM what happens?

If you keep it at a steady idle RPM what happens?

If you compare the electrical systems between two different chassis and or manufactures with no "control" group is it a valid experiment?

The answer to all of this is RPM dictates power generation which generates the output of light in this case. Alternators at idle will maintain the voltage in a system, if you increase speed it will produce more voltage, if you go from increased speed to idle speed you will maintain the energy that was previously produced, eventually is will taper due to variables like drag or electrical draw but over a long period.

Arguing that this is some kind of issue because other cars don't do the exact same thing is invalid due to the fact that your comparing two at the least completely different electrical circuits and looking for an identical or similar result which wont happen due too many variables.

You could possibly change this behavior by just using a different type of alternator perhaps one not manufactured by Nissan since it's a strong possibility that all Nissan alternators have similar characteristics.