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[* black] The primary ground for your car's electric system is the ground on the car's battery. It connects to the chassis of the car next to the battery itself.
-[* black] Begin by disconnecting the ground or negative terminal from your battery. Follow it to the attachment point on the chassis; it will be very nearby.
+[* black] Begin by disconnecting the ground or negative terminal from your battery. For guidance on removing the terminal, and for other suggested battery maintenance while it is disconnected, [guide|20575|click here to see the battery maintenance guide.] Follow the cable to the attachment point on the chassis; it will be very nearby.
[* red] Loosen and remove the nut that holds the battery ground cable to the chassis, which will allow you to set aside the cable for now.
[* black] Use some emory cloth, very fine sandpaper, or a soft metal brush such as brass to remove any dirt or corrosion from the area where the battery cable connects to the chassis. Then re-install the cable and reconnect it to the battery.