Alternator AC Ripple: Why Normal Charging Voltage Can Still Hide a Problem
A normal charging-voltage reading doesn't always mean the alternator is healthy.
In this episode of Around the Wheel, take a closer look at alternator AC ripple, what causes excessive ripple, and why it can create difficult-to-diagnose electrical problems on today’s vehicles. Learn how rectifier and diode problems affect alternator output, where technicians should test for ripple, and how an oscilloscope can reveal problems that a basic charging-voltage check may miss.
Watch the video to see why alternator output is about more than just the number on the meter.
About the Author
Erik ScreedenErik Screeden
Technical and Multimedia Content Director
Erik Screeden is the Technical and Multimedia Content Director for the Vehicle Service & Repair Group. Erik is an ASE Master Automobile Technician with L1, and L4 credentials, who has been in the industry for over 25 years in various capacities. During that time, Screeden was a technician. He started out at a Ford dealership and continued to several independent repair facilities as well as spent time in the specialty aftermarket at a GM-specific performance shop. After his time as a technician came to an end, Screeden transitioned into a role providing scan diagnostic and J2534 tool support. He was then able to parlay his experience as a technician and a support specialist and use that in several technical sales roles.
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