31-01-2019, 02:31 PM
There is a circular band of spring steel, around the body of the dynamo, that is secured by a screw and shaped nut. Remove it. Looking at the rear of the dynamo (i.e. the end nearest you, from which you removed the band, the third brush moves anti clockwise to increase, clockwise to decrease. Move it about an 1/8th of an inch at a time, start the engine to check output on ammeter. Stop the engine and move it again if necessary etc etc.