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This sort of thing happened to me on my last E90 330d, after buying an ebay OEM equivalent alternator. Sometimes it wouldn't be charging but after a few weeks, it would always get to 14V+ albeit a few seconds after the start.
After having one of those dreaded charging fault messages on the cluster, I invested in a USB lighter socket charger with a built in voltage monitor. I didn't want to be stranded in an awkward location with a dead battery. Only drive off if the alternator is actually charging the battery.
For info, this issue was more likely from a cold start in the mornings.
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Current: F30 335d xDrive, E91 LCI 330d
Previous: Honda Civic 2.2 cdti, E90 330d, E46 330d Saloon, E36 328i Sport Coupe, E36 325iS Coupe, E36 318iS Coupe, Escort xR3i, Renault 5
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