How do you measure the amperage of the vehicle running without specialized equipment or pulling off a battery post and using a meter with low gauge wire (that can handle the amps) to measure amps between the positive cable and the meter?
Maybe there is a tool out there that does this, but I have never seen it. One can measure voltage at the battery before the car is running and after the car is running. One can load test the battery. But I have never seen a mobile diagnostic tool that can measure a battery's ability to accept amps, and the number of amps, while installed in a running vehicle.