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Secondary Wire Resistance Test

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  1. Test coil and spark plug cables with an ohmmeter. Do not puncture secondary wires when making the resistance check. Connect leads to each end of the cable.
  2. Resistance for Courier vehicles should not exceed 570 ohms per inch. For Mazda vehicles, resistance should not exceed 16, 000 ohms for each 39" (1 m). For Chrysler Corp. vehicles resistance should not exceed 22, 000 ohms per cable.