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Ohmmeter reading at a poor connection

Aviation Mechanic General (AMG) practice question 4 of 41 on Fundamentals of Electricity and Electronics. ACS element AM.I.A.K18 · difficulty: standard. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA mechanic uses an ohmmeter to check continuity through a connector and finds an over-crimped pin making a very poor connection. What does the ohmmeter indicate?

  1. AInfinity or a very high resistance
  2. BA near-zero resistance, the same as a short
  3. CA reading exactly equal to the internal battery voltage
Show the answer and explanation

Correct answer: A. Infinity or a very high resistance

  • A — correct The handbook states that if the circuit is open or has a very poor connection, such as an over-crimped pin in a connector, the ohmmeter reads infinity or some very high resistance.
  • B — incorrect A near-zero reading indicates a good connection; it is the opposite of what a poor connection produces.
  • C — incorrect An ohmmeter indicates resistance, not voltage; its internal battery only supplies the test current.

BACKGROUND

An ohmmeter is often used not to measure the resistance of a component but to check the integrity of a connection from one part of a circuit to another, which is called a continuity check. A good connection reads a near-zero resistance, essentially a short. An open circuit or a very poor connection, such as an over-crimped pin in a connector, reads infinity or a very high resistance. While the measurement is being taken, the mechanic should avoid touching the circuit or probes, because body contact can introduce a parallel path and give a misleading indication.

STUDY TIP

Think of continuity as a pass/fail test: near zero means connected, infinity means open.

KEY POINTS

  • A continuity check verifies the integrity of a connection.
  • Good connection: near-zero resistance. Open or poor connection: infinity or very high resistance.
  • Do not touch the probes or circuit during the measurement.

SOURCES

  • FAA-H-8083-30B ch12 "Continuity Checks"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.