When you say that you fitted an Alternator and it appeared to cure it, How long has the new unit been fitted before the problem returned. ?
The Main way to tell the difference between the 2 types of alternator are, The Old Type -- ( usually up to about 2004 which fits the standard engine and some early common Rail versions, The Terminals should be Marked L and W. and is Usually but not always fitted with a standard pulley.
The Later Type Fitted around 2004 onwards is marked up L and F and is Usually fitted with a Clutch pulley.
If you buy a Chinese copy alternator or a Recon unit and it isn't marked up then you will struggle to see the difference.
H.T.H. Tony.
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