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Yes it is easy to test,Connect your analog meter to positive lead on rectifiers & the black to the mounting stud of the diodes, Record the test results. Oh set on 200,000 ohm scale. flip meter leads to opposite leads & record again. The ratio between first & second test should be a ten to one ratio. Now put meter leads on the two red leads that go to the stator or alternator leads. Again flip the leads polarity & results should be a ratio that is 2:1. In the drawing it shows 4 diodes & to test each diode would be put meter leads on each end, then flip the leads it will pass current one way & almost stop it going the other way. Being built together it is hard to test as a guy can’t get at all 8 leads & isolate. Check while running too on a 25 volt D.C. scale to see if you are charging, Next change the meter to A.C. If you show charging in the AC mode the bridge rectifier has faulted. On AC the meter should show no charging.