Rectifier Test

1998 Chevrolet Tracker 2D Utility, RWD, AutomaticSECTION Rectifier Test
  1. Using an ohmmeter, measure resistance, between each diode lead and upper/lower rectifier bodies. Perform STEP 1. See Fig 1 . Check resistance in both directions by reversing ohmmeter leads. Resistance should be greater than 5 ohms in one direction and less than 5 ohms in the other direction. If resistance is not as specified, replace rectifier.
  2. Using an ohmmeter, measure resistance between diode trio leads. Perform STEP 2. See Fig 1 . Resistance should be greater than 5 ohms in one direction and less than 5 ohms in the other direction. Replace rectifier if resistance is not as specified.
Fig 1: Testing Generator Rectifier
G91H02007Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.