Starting the engine from the battery of another car

To start the engine from an external battery, connect the positive (+) two battery terminals. Then connect the other wire negative (-) terminals (pic. 26). Instead of the negative terminal, the second wire can be connected to any metal part of the engine that has a reliable connection with "weight". Remember that reverse polarity can completely destroy the semiconductor devices of the electrical systems of both vehicles.



When connecting batteries, pay attention to the following:

• 1. The external battery must have the same nominal voltage as the discharged one.
• 2. Connecting wires must be thick enough to carry the starter current (about 300 A).
• 3. The wire clamps must be in good contact with the battery terminals.
• 4. The wires should be connected to the discharged and external batteries at the same time: first connect the positive terminals, and then the negative ones.
• 5. If the external battery is installed in another vehicle, start its engine before starting the engine with a dead battery to prevent the second battery from draining quickly.
• 6. Before disconnecting the wires, reduce the speed of both engines to 1000 rpm or less.

Do not disconnect the vehicle electrical wires from the battery while the engine is running.