"check for an open (disconnected wire or broken wire) to the Field of the alternator. You could also have a bad regulator. Without a Field reference, the alternator "assumes" there is no voltage to your main bus"
With a broken or disconnected wire to the (rotating) field, the alternator will not charge at all.
The regulator doesn't use a "field reference" (whatever that is) to sense voltage, but rather senses the output voltage either at the output stud or nearer to the battery to make up for voltage drop in the charging wiring.
If the voltage sense wire is connected to the battery cable at a starter switch or solenoid, that's where the charging voltage needs to be checked, as the voltage at the alternator will always be at least some higher than at the point where voltage is sensed.
I mentioned checking that the voltage sense wire is intact.
The OEM Delco regulators typically had an internal setting the regulator would "default" to, if the external "sense" connection is lost, possibly around 16 Volts.
NOT sure if the cheapy generic regulators now being sold do that, or simply go wild.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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