Precautionary measures
If the prescribed procedure is not followed, there is a risk of burns from acid escaping from the battery. In addition, there is a risk of injury and injury if the battery explodes. Damage to the vehicle's electrical equipment is also possible.
- Beware of electrolyte contact with eyes, skin, clothing and bodywork. It has a corrosive effect. If electrolyte is spilled, wash it off with clean water and, if necessary, consult a doctor.
- Keep sparks or open flames away from the battery.
- Wear protective goggles.
- Protect the booster battery wire from being damaged by rotating parts such as radiator fan blades.
The cross section of the wire to facilitate starting an internal combustion engine with a volume of up to 2.5 liters must be at least 16 mm2 (diameter about 5mm).
For diesel engines and internal combustion engines with a displacement of more than 2.5 liters, the cross section must be at least 25 mm2.
In this case, you need to focus on a car with a discharged battery. The cross section of the wires is usually indicated on the packaging of the wires of the launch investment. Both batteries must have a nominal voltage of 12 volts.
Attention! The battery in A-class vehicles is located in the footwell on the passenger side behind the bulkhead.
A discharged battery can freeze even at -10°C. A frozen battery must be thawed before connecting the start aid cable. The discharged battery of the vehicle to be started must be properly connected to the on-board network.
1. Check the electrolyte level in the discharged battery. Top up with distilled water if necessary and screw in the plugs.
2. Place the cars in such a way that their metal parts do not touch, otherwise a current may already occur when the positive poles are connected.
3. Apply the parking brake on both vehicles. Set the manual transmission to neutral, the automatic to «R» = «parking».
4. Turn off all current consumers, including the phone in the car.
5. Start and let the engine of the feed vehicle run at idle. This prevents the vehicle's alternator from being damaged by voltage spikes when starting a second vehicle.
6. Open the battery positive protective cover, if applicable.
2.7 How to connect the wires for starting the engine
1 - positive (+) receiving battery terminal A
2 - positive (+) battery terminal B
3 - negative (-) battery terminal B
4 - dot «masses» (-) X on the receiving vehicle
7. Connect the starting aid wires in the following order (see illustration):
- connect the red wire 1 to the positive pole of the discharged battery A;
- connect the other end of the red wire 2 to the positive pole of the supply battery B;
- connect black wire 3 to the negative pole (-) supply battery B;
- connect the other end of the black wire 4 to a good ground X of the receiving vehicle.
Attention! Do not connect the wire to the negative pole of a discharged battery.
A metal part that is firmly screwed to the power unit is best suited for this.
When connecting a wire to the negative pole of a discharged battery, it, under adverse conditions, may explode due to sparking and the formation of explosive gas.
Attention! The terminals of the connected starting aid wires must not be in contact with each other. The wire terminals from the positive battery terminal must not touch metal parts (bodies or frames), forming a closure on «mass» (-).
8. Start the car engine with the discharged battery and leave it to idle. When starting, operate the starter continuously for no more than 10 seconds, as the terminals and wires heat up due to the high current consumption. Therefore, it is necessary to provide «cooling» pauses of at least half a minute.
If the engine starts with difficulty, do not operate the starter for a long time unnecessarily. When starting, there is a constant injection of fuel into the system. It is better to establish the cause of the difficult start.
After successfully starting the car engine with a dead battery, leave the engine to idle and do not dismantle «electric bridge» for at least 3 minutes.
To avoid voltage peaks when disconnecting auxiliary wires, turn on the passenger compartment airflow and rear window heating on a car with a discharged battery. Do not turn on the headlights, otherwise the bulbs will burn out.
9. Disconnect the auxiliary wires after starting the engine in the reverse order to connection. Disconnect the black wire first (-) 4 from the receiving car, and then from the supply car.
Red (+) the wire is first disconnected from the supply battery, and then from the receiving (see illustration 2.7).