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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A6 Charging system: practice questions

Our ASE A1–A8 bank has 5 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A6 Electrical/Electronic Systems

A charging system shows low output only at idle. What should be checked first?

  1. The headlamp aim
  2. Drive belt condition and tension
  3. The starter drive and flywheel teeth
  4. The fuel pump
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B. Drive belt condition and tension — Also check pulley and tensioner condition.

Question 2 · A6 Electrical/Electronic Systems

How is charging system voltage drop on the output wire checked?

  1. Checking belt tension
  2. Measuring starter draw
  3. Measuring between the alternator output terminal and battery positive while charging
  4. Measuring battery open-circuit voltage after the engine has been running at high idle for several minutes
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C. Measuring between the alternator output terminal and battery positive while charging — Do the same on the ground side.

Question 3 · A6 Electrical/Electronic Systems

Battery voltage reads 16 volts with the engine running. What is likely?

  1. A weak battery
  2. A slipping drive belt that lets the alternator overspeed
  3. An overcharging fault, such as a failed voltage regulator
  4. A blown fuse in the radio
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C. An overcharging fault, such as a failed voltage regulator — Overcharging can boil batteries and damage electronics.

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