Why wont my alternator charge on a 97 astrovan replaced starter and had the altenater checked was good does wiring have anything to do with charging?

There are a few reasons why your alternator might not be charging on your 1997 Astrovan, even if the alternator itself has been checked and found to be good. Wiring issues can indeed be a cause, so it's worth investigating the electrical system to identify any potential problems. Here are a few things to consider:

1. Loose or Corroded Connections: Check the electrical connections between the alternator, battery, and starter. Loose or corroded connections can cause resistance and prevent the alternator from charging the battery properly. Ensure all connections are tight and free of corrosion.

2. Damaged Wiring: Inspect the wiring harness for any signs of damage, such as cuts, breaks, or fraying. Damaged wiring can cause interruptions in the electrical circuit and affect the alternator's ability to charge the battery.

3. Voltage Regulator: The voltage regulator is responsible for controlling the alternator's output voltage. If the voltage regulator is faulty, it can prevent the alternator from charging properly. Check the voltage regulator and replace it if necessary.

4. Wiring Diagram: Refer to the wiring diagram specific to your 1997 Astrovan to understand how the charging system is connected. This will help you identify any potential wiring issues and ensure that all components are connected correctly.

5. Ground Connection: Make sure the alternator and engine have a good ground connection. A poor ground can prevent the alternator from charging the battery effectively. Check the ground connections and ensure they are clean and tight.

6. Computer Issues: In some vehicles, the computer may be involved in regulating the charging system. A fault in the computer or its programming could affect the alternator's performance. If you suspect a computer issue, it's best to have the vehicle diagnosed by a qualified mechanic.

7. Dashboard Warning Lights: Check the dashboard warning lights. If the "Battery" or "Charging System" light is illuminated, it indicates a problem with the charging system and requires immediate attention.

By investigating these potential causes and thoroughly checking the wiring, you can increase your chances of identifying the source of the charging issue in your 1997 Astrovan and getting it resolved. If you are not confident in troubleshooting electrical issues, it's advisable to seek assistance from a professional mechanic.