The plug for the 2 wires fit right in. How would I know if they are reversed, and if reversed would it do any damage? The new alternator does not have an internal regulator.
It reads you have an 10DN alt, OE design - external regulated.
Alt two-wire plug, as you look at the rear of the plug connected, blue wire to right side, white wire to left side.
Old roadside trick, if you lay a screwdriver across the rear alt bearing, a working alt will generate a magnetic field and screwdriver will have resistance when pulling it away.
the regulator closes a relay internally to turn off GEN light if alt is charging.
Ensure reg has a ground strap from the chassis to the radiator support - OE design had a strap about a mounting bolt.
Ensure alt case has less than 1 ohm resistance to the reg chassis - might need to run a separate wire for ground as alt case must rely on mounting bracketry and hardware for path. If a lot of paint, conductivity is nil.
If you measure 3-5 volts on blue wire at alt wirth engine running at 2000 rpm, and less than 12.
3 volts at BATT stud of alt, bad alt - open diode or worn brushes.