Thanks for your reply. I am running 12volt system. I'm in the UK & the Vintage Sports Car Club here do not allow modifications such as fitting an alternator. So even for night rallies in winter you would be disqualified for running with one!! I read somewhere that the old dynamo could be "chipped" to give an output hat varied with the demand - going higher than the standard 10 amps if required but cannot find any detail on how to do it.
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If you are trying to get more amps out of the original product you probably can't. What most people do in adapt a modern alternator, even though it's not original style. If you are showing the car, most judges allow for safety improvements, atleast in the shows I exibited my '32 Ford in. It would be easy to get a more modern and powerful generator or adapt a modern alternator to your car. There are kits that have instructions and brackets. Part of the problem is that you are running 6 volts and there is a reason that no one builds cars using 6 volt systems anymore, a 12 volt system is just a better system.
I concur with you there. L