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On the face of it, it certainly looks like an alternator problem - barely 13 volts with no load seems low.
I wonder what the v reading is if you leave the engine running, switch on all the lights, fans, A/C etc and then read the battery voltage again. I wouldn't be surprised if its even lower - maybe even drawing current from the battery ....
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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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