Modern cars are rolling computers. Using old-school jumper cables incorrectly can cause thousands in electrical damage. Learn the safe way to boost your battery.
The Risk of Voltage Spikes
In older vehicles, a jump start was a simple mechanical process. In modern cars, the ECU (Engine Control Unit) and various sensors are extremely sensitive to voltage fluctuations. A sudden "spike" when connecting cables can fry expensive circuitry instantly.
The Safe Connection Sequence
- Connect the RED (+) cable to the dead battery's positive terminal.
- Connect the other end of the RED (+) cable to the donor battery's positive terminal.
- Connect the BLACK (-) cable to the donor battery's negative terminal.
- CRITICAL: Connect the other end of the BLACK (-) cable to a solid, unpainted metal part of the dead car's engine block—NOT the negative terminal of the dead battery. This prevents sparks near the battery (which can emit explosive gases).
Post-Start Protocol
Once the car starts, let it run for a few minutes before disconnecting. Turn on the heater or rear demister in the dead car—this helps "soak up" any voltage spikes when the cables are removed. Disconnect in the exact reverse order.
Note: If your battery is completely flat, it may be a sign of an alternator failure. If the car dies again shortly after starting, call Drivon for a tow to your preferred mechanic.
