[rotorwrench]

Induction meters only show the amount of current flow at any given time. It may show a charge for a bit imediately after you start the car but will go back to neutral after the battery is up to full charge state. It will show a discharge when the generator is inoperative or not keeping up with the current draw such as at night with lights on and brake lights on with heater fan and other electrical accesories also on.

If you have a volt/ohm meter, you can measure the voltage at the battery with the car running. The voltage regulator will boost the voltage above the 6-volt mark. It may not read exactly 7.2-volts but it should be above 6-volts in most cases.