May 092016
 

1998 Chevy Astro Starter ProblemThe battery has a full charge and plenty of gas and it wont start could it be the starter?


RESPONSE

Of course it could be if the engine is not turning over at all. But testing the starting system first may be the best course of action.

  • Check for good battery negative at starter case
  • Have someone hold the ignition key in the “START” position
  • Check for Battery Positive at the “S” terminal on the starter, if seen replace starter. If not seen, check the starter relay and neutral switch. Then trace wiring in the wiring-harness.

1998 Chevy Astro Van Starter Wiring Diagram

1998-chevy-astro-starting-charging-starting-circuit-1-of-1

Starting System Operation

Voltage is applied at all times to the Ignition Switch from Fuse 6 through the RED (242) wire. When the Ignition Switch is turned to the Start position, voltage is then applied to the CRANK fuse through the YEL (5) wire. From the CRANK fuse, voltage is applied to the Park Neutral Position and Backup Lamp Switch through the PPL (806) wire. When the Park Neutral Position and Backup Lamp Switch is placed in Park or Neutral, voltage is then applied to the coil of the Starter Relay through the YEL (1737) wire. Since the Starter Relay is permanently grounded at G104 through the BLK (850) wire, the relay will energize.

Voltage is applied at all times to the  Relay contacts from Fuse 6 through the RED (242) wire. When the Relay energizes, the relay contacts close, and voltage is then applied to the Starter Solenoid. Since the  Solenoid is permanently case grounded, the Solenoid will energize two coils. The Pull-in Winding coil will energize to pull the  Solenoid contacts closed. When the contacts close, a plunger on the contacts will cause the Pull-in Winding coil circuit to open. Then the Hold-in Winding coil will hold the Solenoid contacts closed. Voltage is then applied to the Starter Motor from the Battery through the BLK (1) wire and closed contacts of the  Solenoid. Since the  Motor is also permanently case grounded, the motor will run until the Ignition Switch is moved out of Start position. When this happens, a spring in the  Solenoid will move the  Solenoid contacts and the plunger back to the rest position.

 

 

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