Jump starting with cables — the order that prevents sparks
The wrong connection order is the most common cause of a spark next to the battery. The right order takes the same time.
Symptoms
- The starter clicks but does not turn
- The dashboard lights up weakly and dies
- The car starts only when pushed
The order matters because a battery gives off hydrogen. A spark right next to it is the risk the correct sequence removes.
Before you start
The two cars must not touch. Switch off the engine of the healthy car. Check that both batteries are the same voltage — usually 12 volts.
The connection order
1. Red cable to the positive terminal of the flat battery. 2. Other end of the red to the positive of the good battery. 3. Black cable to the negative of the good battery. 4. Other end of the black — NOT to the negative of the flat battery, but to bare metal on the engine or chassis, away from the battery.
That last point is the whole difference. If a spark jumps there, it is far from the gases.
Afterwards
Start the healthy car and leave it running for 2–3 minutes. Then try the flat one. If it does not start within 10 seconds, stop — prolonged cranking overheats the starter.
Disconnect in reverse order: black from the chassis, black from the good battery, red from the good, red from the flat.
When not to try
If the battery is swollen, cracked or smells of rotten eggs, do not connect it. If the car starts but dies the moment you disconnect, the problem is the alternator, not the battery.
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