Sequence of connecting wires when starting an engine with a discharged battery
Park the vehicle with the charged battery as close to your vehicle as possible so that the batteries are practically side by side, but do not allow the vehicles to touch. Turn off all unnecessary electrical consumers.
First connect one end of the wire to the positive terminal of the discharged battery, then the other end of the same wire to the positive terminal of the auxiliary battery. Next, connect one end of the second wire to the negative terminal of the auxiliary battery, and then the other end to «mass», stationary metal point (for example, to the engine mount). Do not connect the negative terminal of the booster battery to the negative terminal of a discharged battery.
Attention. Connect the wires to the auxiliary battery in such a way as to avoid sparking.
Run the auxiliary vehicle engine at increased engine speed until the alternator begins to produce voltage. If the engine does not start immediately, give the starter time to cool. Then start the engine of the auxiliary vehicle, which will slightly charge the discharged battery.
When removing auxiliary cables, first disconnect the cable from the negative terminal of the charged auxiliary battery.
Note. There is a danger of poisoning when operating the engine in a closed room!