Have you used a mirror to look all around the alternator for markings?
I would also get another multimeter for a second opinion or diagnostics to find out system voltage because unless things are radically on newer cars, that's a bad figure if it's correct.
If it's 17.5, what's the variation on that when you load up the electrical system?
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2002 S60 SE D5 Manual
209000 miles
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