Dynamo, replacement or repair

[Nitti]

Hello again,
after some fiddling with bits and pieces in the garage since January, I started up the golden beuty and went for spin. Eveything works, apart from the charging 
Following the Lucas handbook, I began the search at the Dynamo, no sign of any voltage there.
I hoped for some worn brushes, or a broken cable, but found a collector beyond repair, with loose or missing segments...!

My question is, should I buy a new anchor (the rotating part), and hope that the field-wiring (the fixed part) is Ok, or should I go for a new/reconditoned dynamo altoghether ?

Nitti

[fido]

I would check the field coil with a multimeter set to ohms. You need to disconnect both field coil wires then measure the resistance between them, should be approx. 3 ohms. Then check the resistance between one field coil wire and the dynamo casing, should be infinity or at least several million ohms.