No, piggy back of the single field will make a short!
The new regulator shown in first post must be used with later two terminal fied alternator. A picture of back of your alternator would be helpful.
A single field terminal suggests you have wrong alternator. There are electronic old style regulators, and could be used with stock wiring, but really need to verify alternator to be sure.
A new two terminal field alternator can be used with early or late regulators with correct wiring changes, but a late regulator will only work with late alternator.
It s best to verify field of late style is isolated by measuring field terminals to case and check for open with Ohm meter. Also test for continuity of a few Ohms between terminals.
