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Which fault does a charging voltage of 16 volts indicate?

  • A.A slipping belt
  • B.A poor earth connection, which introduces resistance and therefore causes the regulator to sense a lower voltage
  • C.A failed voltage regulator
  • D.A discharged battery, which draws a heavy current and therefore raises the voltage measured at the terminals

Answer: C

An overcharging system points to the regulator, which is integral with the alternator on most vehicles. A poor sensing earth genuinely does cause overcharging by fooling the regulator, which makes the last option a real mechanism. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape.

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