motor wont turn over on 2000 Volvo V70

it ramdonly wont turn over. sometimes it starts fine and other times it just clicks.

Asked by for the 2000 Volvo V70
Assuming you've checked the battery and charging system and they check OK,
I suspect that the starter is failing. Check that you have battery voltage at the big starter cable, and battery voltage at the smaller START wire at the starter when your assistant turns the key to START. If so, and the starter doesn't run, then it's faulty.
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