Practice question

What precaution must a mechanic take before using an ohmmeter to measure the resistance of an automotive component?

  1. Ensure the circuit is fully powered and operating
  2. Disconnect the component from its power source and isolate it from the circuit
  3. Connect the meter leads in series with the battery ground cable
  4. Set the meter to the highest AC voltage range first

Answer: B — Disconnect the component from its power source and isolate it from the circuit

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