I got the van mot’d 2 weeks ago and everything was ok no issues parked it up on the drive that was that .So i was installing some new alpine speakers in the door on my t6 i started on the passenger side fitted the speaker no issues came to start the van and it was nearly dead it tried to turn over then died problem is I've charged the battery and now it wont start on turning the key all is as it should be no eml anyone have any pointers ?? Thanks