No longer charging found broken wiring

The engine connector includes critical circuits. :(

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R6 is power from the alternator.
J2 is Ignition run, which includes power to the alternator's rotor and the voltage sensing wire to the voltage regulator.
R3 is the connection from the alternator's rotor (aka field) to the regulator.

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If the ammeter shows discharge with the engine running, then there is a problem with the alternator circuit or the alternator.
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It should show slight discharge while starting, then charge after starting and then centered after a few minutes.