Trying to measure alternator ripple with a multimeter is pretty much futile. Scope is much better for that but if your alternator is otherwise fine and previous stereo was working fine it's very unlikely the alternator is at fault.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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