How do you identify a broken conductor in a wiring harness using a continuity check?

How do you identify a broken conductor in a wiring harness using a continuity check?

• A. Use an ohmmeter to check continuity from end to end; no continuity indicates a break.
• B. Visual inspection alone confirms continuity.
• C. Measure current to determine continuity.
• D. Test with a megohmmeter.

Answer: (A)

Continuity means there is a complete electrical path between the two ends of a conductor. To identify a broken wire in a wiring harness, test end-to-end with an ohmmeter (or a multimeter set to continuity) after ensuring the circuit is de-energized. If the meter shows a low resistance or a continuous beep, the conductor is intact. If you see infinite resistance or no beep, there is a break somewhere in that conductor. Visual checks can miss internal breaks, corrosion, or damaged insulation, which is why a proper continuity test is essential. Measuring current isn’t a reliable way to confirm continuity, since current flow depends on the whole circuit and load. A megohmmeter probes insulation resistance, not conductor continuity, so it isn’t appropriate for this purpose.

Continuity means there is a complete electrical path between the two ends of a conductor. To identify a broken wire in a wiring harness, test end-to-end with an ohmmeter (or a multimeter set to continuity) after ensuring the circuit is de-energized. If the meter shows a low resistance or a continuous beep, the conductor is intact. If you see infinite resistance or no beep, there is a break somewhere in that conductor. Visual checks can miss internal breaks, corrosion, or damaged insulation, which is why a proper continuity test is essential. Measuring current isn’t a reliable way to confirm continuity, since current flow depends on the whole circuit and load. A megohmmeter probes insulation resistance, not conductor continuity, so it isn’t appropriate for this purpose.