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How to diagnose? (battery or charging system)

  • 2002
  • 911 Carrera 4S
Mileage: 
59 000
Electrical and Electronic
Montreal, 
Quebec

A couple of times recently the car has been a little hard to start. Yesterday, parked after a 20min highway drive. Started 45 min later no problem. Drove to the store 10 min away. Couldn't start it again. Click click dead battery. Junpstarted it with another car and it started no problem.

I expected voltmeter to show ~14V but it was a little above 13.

To make a long story short, how can I make sure the charging system is working properly? What are normal values at idle? Higher RPM? With or without accessories on? Etc...

Thanks in advance!

K

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