Dim lights

I have a 74 primavera, running AC only and my head lamp and tail/brake lights are all very dim when at idle (and not all that bright when above idle). How can I get my lights to be brighter?

I think you will find that that is usual for an older AC vespa. You could look into updating it to 12v electronic as used on the ET3 Primmy or one of the ones off the PK`s