CAV DEL type dynamo question

[Mark McKibbin]

I am working on my new to me Chummy and the dynamo is a CAV and it looks like a type DEL,

1.  it produces virtually no voltage (0.5v)  
   
2. the brushes are good,
   
3. it will motor although it does not seem to go that fast,
   
4. I have used a growler and it finds no short circuited windings
   
5. The field coils measure 1.8 ohms
   
6. moving the 3 brush seems to make little difference
   
7. I have no idea if the dynamo ever worked as previous owner is dead 
   

The armature looks to have been rewound in modern times, I'm wondering as this type of dynamo has the brushes at 90 degrees is it different to those with brushes at 180 degrees and if so has it been rewound properly?

Picture of armature attached