12-08-2021, 09:45 PM
The simple answer for the charging circuit is to wire an ordinary on/off switch across the two connections on the dynamo. In the 'on'position you will get full charge, and in the 'off position you will get half charge. Leave the two wires in place; one of them allows current out of the dynamo to the cutout and thence to the battery, and the other is irrelevant in this situation, but you don't neccessarily know which is which. Make sure the normal dynamo connections going to the knackered dashboard switch do not connect to earth by being left hanging in the air (some insulating tape or put a connector on with nothing the other side).