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Testing a dynamo and checking output

The dynamo is a robust and simple type of generator which was fitted to many earlier cars. Most modern cars are fitted with an alternator. Read more

Replacing dynamo brushes

The carbon brushes are a sliding fit in oblong holders on the dynamo endplate. Coiled springs bear against the tops of the brushes to hold them in contact with the commutator. Read more

Removing and refitting a dynamo pulley

The most common reason for removing a dynamo pulley is to fit it on a new dynamo — most replacement dynamos are supplied without one. Read more

Replacing starter or dynamo bearings

Starter-motor bearings are usually bushes made of graphite-bronze. A few starters - especially heavy-duty types - have ball bearings at the pinion end. Read more

How to fix a dynamo

Wear on the carbon brushes and commutator is the most common cause of dynamo failure. Read more

Cleaning and replacing a control box

On cars with dynamos, faults in the control box show up in various ways, some of which are described in Testing a dynamo and checking output. Read more

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