A while back I posted about fixing my alternator.
here's the full story:
About a week before the battery light came on, I tested the charging and it was fluctuating between 12.88V to 13.24V. Then the battery light came on.
Now, after fixing the alternator, the battery light is off, but the charging is still the same. Not stable, jumping from 12.88V to 13.xxV to 14.xxV.
*but* as I shift the car to reverse - it immediately stables to 14V
Any ideas?

 

Wouldn't it be nice if everyone became familiar with the Nissan Variable Voltage Control System, and how it operates? Nissan has used that system for a few years now.

2016 February-March Issue 6 TechTalk Issue (nissantechnicianinfo.mobi)

IC voltage regulator (built into the alternator)

For example: The 2016 Maxima variable voltage control will regulate voltage output between 11.6 and 15.6 volts.

For example: On the 2016 Maxima, if the variable voltage control is not active (no PWM signal), the IC voltage regulator will control voltage output between 14.1 and 14.7 volts.

• Regulates the voltage output of the alternator within the specifications for a given vehicle.
• The variable voltage control system supplies a Pulse Width Modulation (PWM) command signal to the IC voltage regulator to control power generation.
• If the IC voltage regulator does not receive a PWM signal, it will regulate power generation based on the design specification of the IC voltage regulator.

Battery current sensor

• The battery current sensor is installed to the battery cable at the negative terminal. It detects the charging/discharging current of the battery and sends a voltage signal to the ECM.
• Some vehicles have a battery current sensor that is a separate part from the negative battery cable, while others have a battery current sensor that is integral with the negative battery cable.