the picture is incompletely labeled ( at the ammeter )
and implies ( to me ) that the ammeter is connected backwards
With all respect to the author of that article , who seldom makes mistakes .
the gamba pic is electrically OK , will function ... but functionally backwards .
zero-center ammeter we are familiar with
has a ( plus amps ) side ( deflects clockwise from zero ) ... and a ( minus amps) side ... ( deflects counterclockwise for zero )
... the battery
gets connected ... always to the plus amps side ( not labeled in the pic ) (but which looks to show battery
connected to minus amps side )
1. for positive ground ... the plus amps terminal >>> goes to negitive voltage terminal . ( deflects on the positive side )
2. and the loads and rectified charging stuff ... all connect to minus side of ammeter ( side that deflects negative amps )
Using the gamba pic ... switch the input leads , side for sidė , at the ammeter and it will read correctly
the ammeter acts like a balance beam , or flag in the circuit , measuring the voltage levels ... from two different power sources .
when voltage on the charging side becomes higher than battery
voltage ... the flag waves plus
... and the battery
is driven chemically , by the voltage differential , back into a state of re-charging
( the battery
becomes just another load on the charge circuit )
... amp meter deflects towards the battery
, when battery
is the lower of the 2 voltages ...
Number of amps-in , indicates the amps of charge specifically into the battery
1. A discharged battery
will have a large amp flow ( if the charge circuit is able to deliver it )
2. And charged battery
it will show only a very small plus amp flow ( even if the charge circuit is able to deliver more )
... because ultimately , the resistance of the battery
will stabilize to maximum regulated voltage .