We bought a new loom and with the new wiring and cleaned up connections (even a few spade connectors :oops: ) we have had good results from our 6v system!
We found that it was not charging but this turned out to be the cheapo "Hugo" regulators that we used at the last minute! :roll: :lol:
So yes, as said in the link above clean connections will do a world of good as a 6v system drops in power more easily than a 12v system.
Also, and this may be of no use to you, I recently fitted relays to power our flashing indicators on all four corners. (semaphores are great but completely useless!) We were simply using the semaphore switch to feed the flasher relays but this meant that the semaphores would barely come on and the flashing lights were dim. By using relays I made the semaphore switch power the semaphores as standard and they also engage a good 6v feed from the coil and this power the flashing indicators. Now they obviously flash a lot brighter as they were not really visible in daylight (when we are always driving! :shock: :lol: )
So yes, stick with 6v if you can because if your wiring is in good order then there should be no real reason in changing!
However, the problem does come with pootling around not charging much (ie on trips to the shops and back) and when driving at night in the rain with the wipers and full beam on. Apart from this, she always starts even after being sat over winter! 😎