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Could be a bad voltage regulator or Connect a test light in series with - battery cable Remove fuses one at a time until light goes out - that will tell which circuit has current flow, then check that circuit for defect

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Q: How do you figure out what is causing a drain on the battery battery and alternator are functioning properly?
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Batterie light is still blinking after changing the batterie for your 1998 ford expedition What is causing that problem?

The battery light does not mean that the battery is bad, just that it is not charging. Usually that means that the alternator or regulator is not functioning properly. Many auto parts retailers will test your charging system for free. Try that to see if anything is wrong.


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Yes, alternators are designed to maintain the battery, or recharge a battery that has been slightly discharged from starting the car. When the alternator is used to recharge a dead battery, it causes the alternator work harder and longer than it is designed for, causing it to overheat, thus causing damage to the alternator. A battery charger should be used instead. They are designed for charging dead batteries. After the battery is charged, let the alternator maintain the charge.


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An auto battery could be leaking for a couple of reasons. The alternator could be overcharging the battery causing the leakage. Or the battery itself could have a short or other internal problem causing it to leak when charging.


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