In the event that the car engine with a discharged battery is in good order, when "lighting up", it will start immediately. An engine with problems in the power or control systems and a discharged (from unsuccessful attempts to start a faulty engine) It does not make sense to start up the battery by "lighting up". If, after starting the engine from the "donor" car battery and then recharging the discharged battery, the starter again refuses to crank the engine, then the battery is faulty and needs to be replaced.
For "lighting" you need a set of two connecting cables, always factory (not homemade!) manufacturing. The most important cable parameter is the cross section of its conductor (without insulation thickness). It must be at least 16 mm2 or approximately equal to the cross section of the wire connecting the battery to the starter (also excluding insulation thickness). The length of each cable must be at least 1 m (optimally 1.2–1.5 m).
At the ends of each cable, clamps are factory-installed for fastening to battery terminals. In order not to reverse the polarity when connecting, one of the cables or only the handles of its clamps are colored red. This cable is typically used to connect the "positive" battery terminals. The cable connected to the "negative" terminal of the battery of the "donor" car is black or blue.
When "lighting" it is necessary to adhere to the following procedure. Apply the parking brake on each car and set the gearshift lever to neutral.
We turn off the ignition on both cars and all devices and devices that have power supply.
We lift the plastic protective cover from the negative terminal of the discharged battery.
Using the "10" wrench, we loosen the tightening of the nut of the terminal mounting bolt..
... and disconnect the wire terminal from the "negative" terminal of the discharged battery.
We lift the protective casing of the wires of the "positive" output of the discharged battery.
We lift the protective cover of the "positive" output of the discharged battery.
We connect the clamp "positive" (red) connecting cable with a "positive" terminal of a discharged battery..
... and the second clip is with the "positive" battery terminal of the "donor" car.
We connect the clamp "minus" (black or blue) cable with a "negative" battery terminal of the "donor" car.
The second clamp of the "negative" cable is connected to the "mass" (body or engine) car with a discharged battery at a distance of at least 0.5 m from the battery itself.
It is best to connect the clamp of the "negative" cable to massive metal, unpainted and uncontaminated engine parts.
We start the engine of the "donor" car, after which we start the engine of the car with a discharged battery. The duration of continuous operation of the starter at each start should not exceed 6 s.
If the engine starts, we maintain an increased crankshaft speed of the car with a discharged battery by pressing the "gas" pedal so that when the battery of the "donor" car is disconnected and the discharged battery is connected, the engine does not stop.
To avoid a sharp surge in the on-board network of the "donor" car, we connect the standard "negative" wire to the "negative" terminal of the discharged battery and disconnect the clip of the "negative" cable from the "mass" of the car with a discharged battery.
We disconnect the clamps of the "positive" cable from the "positive" terminal of the discharged battery and the "donor" battery.
A power surge in the on-board network of a car with an electronic engine management system can disable the electronic engine control unit. That is why it is necessary to start the engine with a discharged battery using connecting cables only in the sequence described above.
Precautionary measures:
- do not touch the uninsulated sections of the terminals of the connecting cables;
- when connecting the "positive" terminals of the batteries with a red cable, make sure that the uninsulated sections of the clamps do not come into contact with any metal parts of the car that have contact with the "ground", this can cause a short circuit and damage to the battery;
- at an ambient temperature of -10°C and below, the electrolyte of a discharged battery freezes. When "lighting up" a battery with frozen electrolyte, an explosion may occur. To avoid an explosion, you must first warm the battery in a warm room;
- the connecting "negative" cable must not be connected to the "negative" terminal of a discharged battery due to the risk of ignition from an accidental spark and explosion of explosive gas released during charging.