This multi-ribbed belt drives the alternator from the engine crankshaft, maintaining electrical-system charge across varying engine speeds. It sits in the accessory-drive loop between the crankshaft pulley and the alternator pulley, with the rib profile matching the pulley grooves to prevent slip under load. A worn or glazed belt causes undercharging and a battery warning light due to reduced friction on the pulley faces. Gates manufactures this belt to the original profile and pitch length so that it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the standard range. On installation, verify belt tension against the manufacturer's specification and replace the belt if it shows cracking or fraying on the ribbed face.