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Electrical Problems Chevrolet Forward Control P30

Diagnosis - A/t

Electrical Problems

  1. Voltage not reaching transmission. Ensure 12 volts reaches transmission to engage solenoid.
  2. Ground inside transmission. Ensure solenoid is not grounded inside transmission case.
  3. Defective connector, wiring harness, or solenoid. Check and repair or replace if necessary. Defective pressure switch (if equipped). Check and replace pressure switch if necessary.
  4. 3rd and 4th gear switches inoperative. Check and replace switches if necessary.