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In this video I show the basic procedure used to check if an alternator/generator is charging a battery, demonstrated on a Massey Ferguson 135, 12 volt system.
This procedure can be used on both 12 and 24 volt charging systems on either an alternator or generator. All you need is a multimeter or a test light that can read voltage. Test the charge by putting your chosen testing device between the positive out let on the alternator/generator and a good earth such as engine block or chassis then with the engine running check the volts being produced. This procedure will give you an accurate measurement of the charge you should be receiving at the battery and can aid in further diagnosis of a faulty charging system.

Disclaimer, I may be a qualified mechanic but I hold the right make it up as I go and am not held responsible for issues arising from advise given in these videos. All mechanical repairs should be carried out by qualified professional.