14-01-2020, 11:51 AM
I am not too familiar with the Austin 7 charging system being a new person to acquire one but i remember from my apprentice days on 12 dynamo cars, you could test a dynamo by removing the wiring from the dynamo, joining the F and D terminals and starting the car, using a volt meter on that bridged wire and earth, you could get up to 90 volts by revving the engine. This was used for test only. The regulator joins the two connections until the voltage reached 14 volts and then kicked out but came back in and out to hold 14 volts. I suspect the 6 volt system regulator would cut the link at about 7 volts, so you will cook batteries and blow bulbs as well as eventually burning out the dynamo by leaving the link on.