Brand new or rebuilt?

I went through 3 rebuilt alternators in one month before I got one that had steady voltage and no spikes or dips. It's free to test it, just set your OBC to show voltage and monitor for a bit. Won't cost you a dime, so what can it hurt right?

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver