1986 Jeep Comanche Base, 2.8 W, 4WD, StandardFACTORY OEM SERVICE PROCEDURE

Testing (On-Vehicle)

  1. With ignition switch in the "RUN" position, charge indicator lamp should illuminate. After engine is running, indicator lamp should go out.
  2. If charge indicator lamp does not operate with ignition switch in "RUN" position, check the gauge fuse by verifying oil pressure indicator is on.
  3. Check lamp ground by jumping terminal "L" (Tan/Green) wire of alternator to ground. If lamp now lights, confirm that terminal "L" and alternator ground are clean and tight. If so, replace regulator. If bulb is good, check the charge indicator circuit wiring for an open.
  4. If charge indicator lamp stays on when engine is running, check the condition of drive belt. Check connections at alternator. Check for battery voltage at alternator terminal "B".
  5. Ensure that alternator ground is clean and tight. Perform charging system test. If alternator output is good, replace regulator.
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:

  • • 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.

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