How do you adjust alterator belt on Vauxhall tigra?

To adjust the alternator belt on a Vauxhall Tigra, first, ensure the engine is off and cool. Locate the alternator, then loosen the bolts securing it to the engine. Adjust the position of the alternator to achieve the proper tension on the belt—there should be a small amount of flex, typically about half an inch when pressed. Once the desired tension is achieved, re-tighten the bolts securely.