The ground wire typically runs along the body of the vehicle, connecting every electrical device to the battery.
Corrosion, loose connections, and physical damage due to road conditions are some of the reasons why electrical issues can occur.
A lack of solid ground can also cause certain symptoms to occur, such as flickering or dim lighting, hard starting, and a low charging system output, among others.
You can usually find the main battery-to-engine and battery-to-body grounds by just looking, but finding harness grounds feeding a component will usually require an accurate wiring diagram with ground location information.
Resolving ground wire issues typically involves tightening the attachment bolt or reattaching disconnected wires, provided that there are no signs of physical damage.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.