Dynamo no go

[bob46320]

If the internal wiring is correct, then as others say, you need to run it like a motor. If you get the battery the wrong way round, you get a negative voltage, but no harm done, just put the battery the right way round and try again. If the dynamo is in situ on the car, you can "Flash" the dynamo into action by pressing the contacts in the voltage regulator together for a couple of seconds (Much frowned upon) - but it works.