I have to assume the power supply on my '63 Grumman 292 is a generator, correct?

Question 1} how to tell the difference between a generator and an alternator?

2} What are the steps for switching to an alternator?

On yesterday's test run, I found that I am not making enough juice to run the large inverter I installed. This inverter is intended to run a small electric refrigerator and 5000btu AC unit during travel. The 120vac power needs when stationary will be from direct hook-up to an AC outlet or from a portable AC generator.