Yes, the clamp around DC ammeters would be the handiest. But the dash ammeter will tell you almost as much.
With lights off after a start, if the alternator wiring is sturdy enough to the ammeter and the battery, right after a start is when the battery will take the most amps. With lights off the battery gets it all and you can get an fair idea of the alternator capacity then. If the voltage regulator is holding voltage right, the current will taper smoothly with time as the battery comes up to full charge.
If you turn the lights on right after starting and the ammeter still shows a little charge, you have enough alternator, though you may have to run longer to get the battery charged up with the lights on.
An automotive electric shop can change the stator in the Delco case to get a higher current rating.
If you make the wire from the alternator to the ammeter bigger than it is you will get more current from the alternator.
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