The main wire from the alternator went directly through the firewall connector and to the ammeter, and since an ammeter has to be in series in a circuit, all the current necessary to charge the battery goes through that wire.
(The main wire from the alternator; went directly; through the firewall connector and to the ammeter) (an ammeter; to be; in series in a circuit) (the battery; goes; through that wire)
The main wire from the alternator an ammeter the battery
went directly to be goes
through the firewall connector and to the ammeter
in series in a circuit
through that wire