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hey,
recently had similar out of blue, first thing i did was have battery checked and confirmed it was dud so parted with some notes, worked a charm for about 4 days then problem returned, had alternator checked fine apparently, poor thing couldnt even cope with being stood in works car park for length of a shift so i was charging 2 batteries evey day one to get me to work one to get me back. Turns out alternator was open circuit so all the electrickery was flowing backwards turning the alternator into a nice little engine bay heater when stood, which is why alternator test showed fine as technically it was charging when running.
obviously hope this isnt your problem and your good to go
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