This multi-ribbed belt drives the alternator from the engine crankshaft. It sits in the accessory drive system, transmitting rotational force to the alternator pulley to maintain battery charging and electrical system voltage. The belt has eight longitudinal ribs that engage with matching grooves on the pulleys, providing positive drive without slipping under varying loads. A worn belt produces a squealing noise at startup or under electrical load and can cause intermittent charging. The manufacturer designs this belt to match the original rib profile and pitch length, so it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the standard range.