Thanks for the tips, I have tried the Oz makers and they ignore all attempts to contact them except I have not yet tried phone(Bit expensive from UK).The web site is very glam but no reply to my e mails or fax.
What would help is if someone has a circuit (or can suggest where I could look for a circuit)for something similar which I could make up, I assume that an alternator is an alternator even though it is old, so any modern circuit could be adapted to do the same job.