The engine ground provides an electrical return path for the starter motor. You can diagnose and make the repair in your own garage using just a digital multimeter (DMM) and some common tools. However, bad grounds are relatively easy to diagnose and fix, usually in minutes. And a faulty ground is often the cause of these problems.
This may cause all kinds of trouble for lights, sensors, modules and other electrical and electronic components. A bad electrical ground may affect one or more electrical systems because it forces current to search for other easy paths back to battery ground. Bad grounds can cause one or more circuits to come alive when they shouldn't, for example, lights that illuminate on their own, even when the switch is off.Īn electrical circuit needs a good ground to function correctly.
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