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It could have been a loose battery terminal or slightly corroded contact somewhere which firstly got disturbed on the service,and has now been disturbed again by checking the battery/alternator.
I would check the connections and make sure they are all good.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo