Hmmmm? So, power from the battery to ammeter to post (a or whatever) on ignition switch goes to post (b or whatever) on ignition switch when it is pulled on, then down wire to coil and other wire to generator to exicte her on spade terminal 1.
The #10 wire from the alternator provides the charge through the system to the battery.
The #1 spade terminal gets its hots from the battery (at least initially) to excite that unexcited alternator and get her to charge.
And, since the wire from #1 spade is connected to the same post on the ignition switch as is the wire to the coil - the alternator keeps current flowing to the coil as long as the alternator is spinning.
So, by magic, a resistor allows current to flow only one way???? It allows the needed current/ excitement to get the generator to charge, but prevents her from backfeeding to the coil.
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