Splice
The physical body of your DC Equipment is always your GROUND. This GROUND is where you also connect your -VE.
Normally they are used as if they were same but ground means that this connection is linked to earth, negative means that this connection is linked to a negative terminal. It is possible that someone has named the terminal incorrectly and named it ground instead of negative. Voltage between negative terminal and ground is normally 0, that means that they are on the same potential and that there is no danger of short-circuit.
In many cases, a ground symbol is used to save drawing extra lines in a diagram and/or to show that a metal cabinet is used as a return path to save wiring in the ground side.
If one terminal of a battery is connected to the frame of the equipment in which it's used, the connection is generally made with the ground, and this is called a ground connection. It refers to the reference point from which all other electrical voltages are measured.
Radar communication is electronic communication without the use of wires. Radar communication can be between a ground terminal, like a cell tower, and a satellite. Or it can be between ground towers and also between two or more satellites.
Static electricity may build up and discharge through the circuits you are working on. This may damage them. Removing the ground cable, removes the discharge path to ground.
Batteries are neither positive nor negative ground. It is the circuit itself that determines the common ground. For example: If I have two circuits, one needing 6vdc negative ground and the other needing 6vdc positive ground, the battery would be installed the same way in both circuits (positive terminal on the battery to the positive connection in the circuit, regardless of whether the circuit is positive or negative ground). The reason for labeling the ground as Positive or Negative has more to do with how the circuit is wired up, than the actual voltage source. The explanation for that is beyond the scope of this answer.
checkA loose connection on the battery posts, starter battery terminal or line to fuses and relay circuits, battery ground cable connection or a bad connector strap from the engine to the frame. How do you get it cranked in the first place?
bad ground or bad terminal connection!
connection of the ground of all the transmission lines and used as a communication cable between protection devices
The discharge of electrons refers to the movement of electrons from one place to another. This can occur in various ways, such as in electrical circuits where electrons flow from a negative terminal to a positive terminal, or in phenomena like lightning where electrons are released from clouds to the ground.
Check a wiring diagram, they probably are different circuits but may share a common ground (ground is term used when connected to negative battery terminal).