If the battery in our car is discharged, we should charge it as soon as possible. For this purpose, we can use a rectifier or try to start the car with cables connected to another car. Both cars must be close to each other, preferably opposite. We connect the cables when the roadworthy car is turned off.
- First, connect the red (positive) cable to the positive terminal of the charged battery, and then to the discharged terminal.
- Then connect the black (negative) cable to the “donor” negative terminal and the other end to the “recipient” ground. It can be any metal element, e.g. the edge of the motor, but for safety reasons it is better not to connect the cable to the negative clamp.
- We make sure that the cables are well mounted. Now we start the “donor” car, and after a few moments we can try to start the second engine.
- If it works, disconnect the cables without turning off the engine: first black from the car’s weight, then from the “donor” terminal; then red from the charger and red from the charged one.
- Now we need to go on a ride of at least 20 minutes to keep the battery charged. However, if this method does not work, we will likely need to replace the battery.