Pull what said:
Its the TYPE of ammeter that is important not its position
Nonsense! True one would normally use the charge/discharge type of ammeter when locating it between the master solenoid and the busbar (typically Cessna), and the loadmeter type of ammeter if locating it between the alternator and the busbar (typically Piper), but it is the POSITION of the ammeter that determines the nature of the information that is being provided to the pilot, NOT the TYPE of ammeter.
To understand the purpose of the ammeter instrument and interpret it accordingly, the pilot HAS to understand where in the electrical system it is located. Agreed, the type of instrument is a clue, but I've flown older aeroplanes where the instrument has been replaced with the wrong type and it is by no means the definitive answer!