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Charging system diagnosis. 850

My mom's 850 turbo has had a dead battery a few times over the past few months. What steps can I take to verify that the charging systen is operating correctly before I replace the Volvo branded battery? I checked voltage at the posts when the engine was running and I got about 13.28 volts, it did not increase much if at all when the engine speed was increased. I am used to working on my volvo Amazon and Duett so I don't know the proper diagnosis for this new fangled car. Any help would be greatly appreicated. The belt did look like it was in pretty good condition.

Thanks in advance,

mario m.






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