G

GAIN - A comparison of an input signal level to an output signal level.


GASSING - The venting of hydrogen bubbles from battery acid as the battery is recharged.


GENERATOR - An electromechanical device that converts mechanical power into direct current electricity.

GLOW PLUG IN CYLINDER HEAD:

GLOW PLUG - An assembly that resembles spark plug but with a heating element instead of electrodes. Used at the beginning of the starting cycle in a diesel engine to aid compression ignition. Sometimes spelled "glow plug"

GND (or Ground) - Common line for all vehicle power, vehicle chassis ground and engine block ground, connected to vehicle battery negative terminal.


GROUND - The negatively charged side of a circuit. A ground can be a wire, the negative side of the battery or even the vehicle chassis. The ground circuit must be at least the same size or bigger than the positive (hot) wire.


GROUND CIRCUIT - The return side of an electric circuit. Usually the frame, body or engine of a single-wire automotive system.


GROUNDING - Connecting one side of a car's electric circuit to the chassis, body, or engine. These parts then provide a metal path that conducts electrical current back to the car's battery to complete a circuit. Grounding may be done with a jumper wire.


GROUP - A set of battery plates, either positive or negative, joined together but not assembled with separators.


GROWLER - An electrical device for testing electric motor or generator armatures for shorts.