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AV-SCANNER / Service function guides / Battery and charging
This guide teaches you how to diagnose and repair ground strap faults that cause dim lights, slow cranking, erratic sensor readings, and other electrical gremlins. You will learn the theory behind chassis grounds, how to prepare safely, and a step-by-step voltage-drop test that pinpoints bad connections without guesswork. The procedure covers battery-to-engine, engine-to-chassis, and body-to-chassis straps, with variations for different vehicle architectures. After finishing, you will be able to confirm a repair with a repeat measurement and apply aftercare that prevents comebacks.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 11 sections as a branded PDF to use in the workshop.
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