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Charge light cane on. Replaced battery and alternator. Ran great for a week and now the same issue is occurring after new parts installed. Help?!
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Check you main fuseable link. Replace with a green long legged pal fuse -
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If replacing the main fusible link does not fix your problem, you then most likely have a short in the wiring that runs between your alternator/regulator and your fusible link terminals.
The following description of the charging system for the EFI Festiva is a direct quote from my Festiva Electrical and Vacuum Troubleshooting Guide.
Charging System / How The Circuit Works
The Battery and Alternator/Regulator make up the charging system. When the Ignition Switch is in the RUN position, current flows from the Battery through the 25-amp MAIN Fuse Link, the Ignition Switch, and 15-amp Head Fuse Link through the Alternator/Regulator to ground.
While the Alternator Rotor is turning, with current in the Alternator Field Coil, the Alternator produces an alternating-current voltage which is rectified to direct-current voltage to operate the electrical systems and charge the Battery.
The Regulator, which is integrated with the Alternator, controls the charging voltage to approximately 14 volts.
The Charge Warning Indicator is connected across the terminals of a 100 ohm resistor at the Instrument Cluster. For the 1.3L EFI system, current passes through the warning lamp when the Ignition Switch is in the RUN position and there is no voltage at Terminal "S" of the Regulator. When the voltage at Terminal "S" rises above a preset value, the Regulator switching circuit stops the flow of current into Terminal "I" of the Regulator and the lamp turns off.
A Fuse Link is included in the charging system wiring on all models. The Fuse Link is used to prevent damage to the wiring harness and Alternator if the wiring harness shorts to ground, or a booster battery with the wrong polarity is connected to the charging system.
In the Troubleshooting Hints column just below this the following is shown:
Condition: System does not charge - Possible Cause Action
Blown HEAD Fuse Link Check HEAD Fuse Link
Battery too low to accept charge Check Battery, replace if necessary
Inoperative Alternator/Regulator Check Alternator/Regulator, replace if necessary
Since you have replaced your Battery and Alternator and this prevented your indicator light from coming on for a week, I would check the wiring between your alternator and fusible link block in addition to replacing your fusible links with the long legged pal fuses of the appropriate amperage.
The possibility also exists that there is a problem with the components that control the turning on and off of the charging light on the instrument panel.
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