Lame dealers abound. Got an OE alternator from Honda last year for my GF Accord, worked fine cold, when underhood temp rose to normal summer operating temps output dropped to zero and the car died. Called the dealer service dept and was told I might have a bad voltage regulator that needs to be changed out, informed them the regulator is built into the alternator, they should have known this.

Removed the unit brought it back, bench test showed it worked OK, I told them at normal operating temp it fails, went back and forth with the parts manager for over 30 mins B4 he broke down and swapped it out for another one that worked fine.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!