1998 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Testing Diode Trio

To check diode assembly (diode trio), remove assembly from rear cover. Using an ohmmeter, check each diode for continuity. Continuity should be present in one direction only. If continuity is present in both directions, or continuity does not exist in either direction, diode is faulty. If any diodes are faulty, replace complete rectifier assembly.

Factory Service Tools

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When to See a Mechanic

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

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

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