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The issue with the starter is it won't crank without some heavy Juice. If the batterys not charging there's no juice(prob alty), check for loose terminal connections on the back of the alty,starter or battery, could be an easy fix. Just be carefull spinning spanners round the back of the alty and starter crossing terminals is not good. your best bet is too ring a auto electrician
ask them if they'll diagnose the issue and take it from there. Any decent auto lecy shop will do this, It's like a free quote.