The cross-section of the starting cable for petrol engines with a working volume of up to approximately 2.5 liters must be at least 16 square meters. mm. For diesel engines and gasoline engines with a displacement of more than about 2.5 liters, the wire cross section must be at least 25 square meters. mm. The working volumes are indicated for the car engine with a discharged battery. The wire cross section is usually indicated on the package of the auxiliary starter cable. When buying a new wire, it is recommended to purchase an auxiliary starter cable with insulated clamps and a cross section of 25 square meters. mm, as it is also suitable for engines with a smaller displacement.
Both batteries must be 12V.
A discharged battery can freeze even at -10°C. A frozen battery must be thawed before connecting the auxiliary jumper cable.
A discharged battery must be properly connected to the vehicle's electrical system.
Check the fluid level in the discharged battery, top up with distilled water if necessary.
Vehicles should be placed at a distance that excludes their contact with metal parts. Otherwise, current may flow even when the positive pole is connected.
Put both cars on the handbrake. Put the gear selector in the neutral position, if equipped with an automatic transmission, put the switch in the park position «R».
Switch off all current consumers.
Start the engine of the vehicle supplying current and leave it to idle.
Connect the auxiliary starter cable in the following sequence:
- 1. Red cable (+) connect to the positive pole of the discharged battery.
- 2. The second end of the red cable (+) connect to the positive pole of the battery supplying current.
- 3. Black cable (-) connect to the negative pole of the battery supplying current.
- 4. The other end of the black cable (-) connect to the body of the car receiving current, for example, to a metal part firmly screwed to the engine. This reduces charge losses. Under adverse circumstances, when a cable is connected to the negative pole of a discharged battery, it could explode due to sparks and the formation of explosive gas in it.
Check the positive clamp again for tightness. Make sure that the auxiliary starter cable is not damaged by rotating parts such as a radiator fan.
Attention: The terminals of the connected auxiliary starter cable must not come into contact with each other, likewise the positive terminals must not come into contact with the body parts (bodies or frames).
The engine of the receiving vehicle (with dead battery) start and leave to idle. When starting, the starter must not be kept running continuously for more than 15 seconds, as the positive terminals and the cable will heat up due to the high starting current. The pause between two successive start attempts must be at least 1 minute.
During the start-up process, the engine of the vehicle delivering current must be idling. This avoids possible damage to the generator due to voltage peaks during start-up. If the initial idle speed drops a lot, you can add some gas.
Avoid open flames or burning cigarettes close to the battery during start-up, as combustible gases may be emitted from it.
Do not lean over the battery - risk of burns!
After starting, disconnect the cables in reverse order.
Caution: If the cable connection regulations are not followed exactly, there is a risk of burns due to acid ejections from the battery. In addition, injury or injury may result from the battery exploding. In addition, defects in the electrical systems of both vehicles may occur.
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