Hi,Battery light on my 2010 E350 came on,had it checked on Star,Alternator Faulty,recon unit fitted,light came on again,brand new AGM battery fitted,after about 10 days light came on again,had battery rechecked,alternator output very low,could there be anything else or does it seem alternator is no good?Help please.

 

Sure sounds like a bad alternator, do you have a warranty on the reconditioned alternator and the labor?