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A Computer-Controlled Charging System Is Undercharging

question 20

Multiple Choice

A computer-controlled charging system is undercharging. A lab scope connected to the ground side of the alternator field indicates a 90 percent duty-cycle. Technician A says the alternator may need to be replaced. Technician B says the on-board computer may need to be replaced. Who is correct?


Definitions:

Total Impedance

The overall resistance to the flow of alternating current in a circuit, combining the effects of resistance, inductive reactance, and capacitive reactance.

Capacitive Reactances

The resistance a capacitor offers to alternating current, depending on the frequency of the current and the capacitance.

Series RC

A circuit configuration where a resistor and a capacitor are connected sequentially in a single path for current to flow.

Capacitive Circuit

A type of electrical circuit that primarily contains capacitors among other components, which stores and releases electrical energy.

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