OK, so on the regulator, the yellow wire with green connector plugs into the black wire from the alternator,
and the red wire plugs into the wire harness.
So with the yellow and black wire disconnected,
you should see at least 28 volts A.C. at 3600 RPM
on the black wire coming from the alternator.
If you don't see 28VAC volts, then the alternator is bad.
If you do see 28VAC and only see the same 12.5VDC voltage at the battery
terminal whether the black to yellow is connected or not,
then you either have a bad regulator or possibly a bad connection
in your engine connector or elsewhere in your wire harness.
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