Why Voltage Drop Testing Is the Key to Accurate Starting and Charging Diagnostics
In this Tech Tip Short, Erik Screeden breaks down why accurate starting system diagnostics require more than simply swapping parts. Screeden explains how electrical wiring faults, corrosion, and high-amperage circuits can create hidden voltage drop issues that mimic component failure. Using real-world examples, he demonstrates how even slight resistance in cables or connectors can affect starter motor resistance and hinder alternator troubleshooting, potentially leading to misdiagnosis.
Watch the full Tech Tip Short to sharpen your electrical testing skills and avoid unnecessary comebacks.
About the Author
Erik 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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