method is not entirely safe, but give a indication of whether the dynamo works.
D and F to the battery. Other side of battery to be connected to dynamo chassis.
to to use the correct polarity, + or - to chassis, this affects the dynamos
dynamo should run like an electromotor, and in the direction it is normally
pulled. Change of direction is done by switching the wires for the field coil.
above is OK. you should show interest for the wiring and the control box.
the control box
the dynamo mounted and the wiring connected, and a fully charged battery.
Connect a voltmeter, range 20 V dc, one lead to F, the other to chassis.