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Which risk does jump starting present to vehicle electronics?

  • A.Overcharging of the flat battery, which draws a heavy current and therefore raises the voltage of the donor system
  • B.Voltage spikes when the leads are disconnected
  • C.Reversed polarity only, which is prevented by the colour coding of the leads and therefore presents no real risk
  • D.None

Answer: B

Breaking a heavy current circuit produces an inductive spike that can damage sensitive modules. Reversed polarity is a genuine and catastrophic risk despite the colour coding, which makes the second option wrong only in its dismissal. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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