This multi-ribbed belt drives the alternator from the engine crankshaft pulley. It sits in the front accessory drive system, transmitting rotational force to keep the alternator charging the electrical system during operation. A worn or glazed belt slips under load, causing the alternator output voltage to drop and the battery to discharge. The manufacturer Gates produces this belt to match the original profile and rib count of the drive system, so it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the standard range. On installation, verify the belt routing matches the original path and that the tensioner moves freely through its full travel.