Honda-SOHC

Hello,
I am hoping someone can help please…
Bike is a CB750 F1 SOHC 1977
Following a 2 year restoration, I finally took the bike out for a first test. Largely all went well, apart from the distinct lack of charge to the battery.
Checking the stator wires with the bike running at varying rpms (2000- 4000) showed 0 Ac voltage across all three.
Stator resistance is consistent 0.8ohms with no continuity to ground
Field coil resistance is 7.2ohms with no continuity to ground.
The replacement solid state R/R gave correct results on the diode test.
I believe the issue is the field coil is not receiving 12+v from the R/R. As I understand it, with the ignition on the Regulator should supply 12+vdc to the field coil which will then magnetise. This is clearly not happening.
Could someone please confirm my wiring is correct?
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3 Yellow R/R wires to 3 Yellow Stator wires
Green = direct to ground
Red to Battery +
Black to ignition
White to White Field coil wire (being 12+v supply)
The green wire from Field Coil is direct to ground.
With everything connected and ignition on, I expected to see 12+vdc at the white field coil wire, but I am currently seeing 0v. What has gone wrong?
The wiring guide from the R/R manufacturer is:
RED: Positive      YELLOW: Phase input from stator      WHITE: Field Output for Alt.
GREEN: Ground      BLACK: Original sense input for Regulator
Any help greatly appreciated!
James