How to Use a Test Light to Diagnose Car Electrical Problems (Beginner Friendly)

About this video

ommon problems you can diagnose with a test light: headlight or brake light not working, no power at an outlet or accessory, blower motor not turning on, horn not working, radio dead, power window not moving, fuel pump not priming, battery draining overnight, and no start or no crank conditions caused by bad fuses, relays, or grounds.

This method works on almost any 12 volt vehicle including Honda, Toyota, Ford, Chevy, BMW, Mercedes-Benz, Dodge, Jeep, Nissan, Hyundai, Kia, and more.

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