Righto, the battery seems to be able to power all the lights for about 5 mins before going flat. Not great for winter. I'm running a 6v battery with a 6v negative wassell regulator and I've flashed the dynamo for negative earth. The battery is also powering the sidecar lights as well. All bulbs are 6v except for the headlamp which is 12v. The A10 is a plunger from 1950, my thoughts are that a) there should be a 6v bulb fitted and/or b) the dynamo needs renovating. Any ideas or diagnostics that could help?