I have always found Ray Trigg very good for new units. He isnt an electrical specialist but if you give him the numbers from your unit he may be able to match it. Mob 07974 361439.
Im assuming you have jumpered a 24 volt feed to the field coils? especially if the dynamo has not been used lately. Thats always a good way to kick an old unit into life.
Good luck
Dave
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