Dynamator or overhaul existing dynamo?

[Mixer]

I run 6volt on the original 1932 dynamo (3 brush system).  The best thing for a battery is to use it.  If you lay up for the winter,  charge it every 4 - 6 weeks to keep it in trim.  So for me, re condition your dynamo,  unless you want lots of lights and gismos.  The original system worked 80 odd years ago - why change now ?
BobH

All I would add Darren, is to upgrade to led bulbs throughout, after you have sorted your wiring ,the saving in load on the charging system is a revelation and not really expensive. Good luck anyway.
Mixer.