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98 s10 pickup only runs on battery not alternator how do you fix this?

Here are some steps you can take to troubleshoot and fix the issue of your 1998 S10 pickup only running on the battery and not the alternator:

1. Check the alternator belt: Ensure that the alternator belt is properly tensioned and not loose or damaged. A loose belt can prevent the alternator from spinning properly and generating electricity.

2. Inspect the alternator wiring: Look for any loose or damaged wires connected to the alternator. Ensure that the connections are clean and tight.

3. Test the alternator: You can use a multimeter to test the alternator's output voltage. With the engine running, the alternator should produce around 14 volts. If the voltage is significantly lower, the alternator may be faulty.

4. Check the voltage regulator: The voltage regulator controls the amount of current that the alternator produces. If the voltage regulator is faulty, it can cause the alternator to overcharge or undercharge the battery.

5. Check the battery: Make sure that the battery is in good condition and holds a charge. A weak or dead battery can prevent the alternator from charging properly.

6. Check the charging system warning light: If the charging system warning light on your dashboard is illuminated, it may indicate an issue with the alternator, battery, or wiring.

If you lack the expertise or tools to perform these checks and repairs, it is recommended to seek assistance from a qualified mechanic or auto electrician to diagnose and fix the issue accurately.

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