"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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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