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Testing for open circuits by measuring resistance

Fig 1: Testing Open Circuits
G03509035Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 2: Measuring Open Circuit Resistance
G03509036Courtesy of SAAB-SCANIA OF AMERICA, INC.
  1. Make sure the component or lead to be tested is not under tension (e.g. by removing the relevant fuse).
  2. Set the multimeter for measuring ohms and connect the ohmmeter to each end of the component/lead to be tested.
  3. Jiggle the relevant wiring harness while observing the ohmmeter.

    Normally, the resistance of a wiring harness is less than 1 ohm. Specified values apply to components.

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