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PB - the alternator voltage does seem a low @ 13.1 v. What does the voltage go up to when you increase the engine revs?
When I installed my underspeed pulley (which actually runs the alternator at a lower speed) I was getting 14.1 v @ 750rpm and 14.5 v @ 1250 rpm.
Your initial low voltage could be a faulty alternator, or a high resistance ground.
To really know the answer to a faulty alternator you need to load test it - most auto-electrical places (preferably Bosch agents) will be able to do this.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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