I just did the conversion last month. I bought the fields from Patrick's. The lady who did the order said it was a very simple change. She said "if I can do it anyone can". She was a lot of help discussing everything I would need in-order to change from 6vt to 12vt. I decided to have a local shop do the generator. I wanted to make sure the it was in good shape. They cut my armature, replaced a bearing and painted the case for $44.00. Patrick's charged $65.00 for the fields but I also bought runtzs, coil and headlight relay.