Posted by Jim.ME on December 06, 2021 at 19:17:04 from (67.242.178.40):
In Reply to: Grandpa Love posted by crsutton81 on December 06, 2021 at 08:00:48:
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Both yours and grandpa Love's alternators appear to be 3-wire alternators not a one wire ones. If yours was a one wire it has been re-wire to be a three wire, which receives outside excitation to start it charging at a lower rpm.
The battery wire is one circuit. The second wire with the diode in it is the excite circuit and goes to a switched power source, like your key switch. The diode prevents back feed from the alternator to the switch which could keep the engine running with the key off in some cases. The third wire (circuit) is the voltage sensing circuit it connects to a major voltage source to provide system voltage feedback to the voltage regulator in the alternator. The alternator battery terminal is one place it can be connected, the solenoid battery lug is another place. The short harness with the diode is not combining any circuits.
Only a battery wire is needed on a one wire alternator.
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