Pic. 1.5. Connecting wires when starting the engine from an additional battery
Connect the red jumper wire to the positive terminals of both batteries (pic. 1.5).
Attach one end of the black or green jumper wire to the negative terminal of the secondary battery.
Connect the other end of the black or green jumper wire to the negative terminal of the vehicle's battery, or «mass» car details.
Turn on the starter and start the engine.
Wait for stable operation of the engine at idle and carefully remove the connecting wires.