Well I see THIS has completely morphed, which is why it is very important to mention these little tidbits..............
As others have said..............
Simply disconnect the alternator and alligator clip------jump battery to the field connector. If it does not charge..........Look to see if there is a SECOND field connector on the alternator--------you must ground that
BUT BE CAREFUL If they gave you an alternator with two field connectors, which is for 70/ later, you must ground one of them, BUT BE CAREFUL!! Check that one is not already grounded!!! You don't want to connect to the terminal which is already grounded.
Once you get that problem solved, reconnect your green wire and see if it charges. If not, you have likely damaged the VR
SUMMARY:
1...The new alternator can be defective
2....The VR can be defective
3....Some sort of wiring problem
4.....The new alternator may be "isolated field" incorrectly called "dual field"
5.....The new alternator, if isolated field, may be grounded, and if you connected field to grounded terminal, you have now damaged VR
6......The new alternator may NOT have one field terminal grounded, so which you need to ground it
