Off the alternator? No. The functional path is..........blue gets power from the key, it is on the same line as "ignition run." Blue supplies battery power to alternator field.........through the field..........to the green wire.............which goes to the regulator. The regulator controls the amount of field current, to control the alternator output according to the voltage sense at the VR. If you pull the blue OR the green off the alternator, it will not charge.