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Sounds Like Your Voltage Regulator Is Bad. This Is Inside The Alternator On Most Cars. You May Have To Remove It For A Test. But Lots Of Parts Houses Can Test Unit On The Car. Also Your Battery May Be Weak. Start With The Alternator First. Good Luck The alternator could be marginal. If one or more of the diodes are faulty the alternator will not be capable of producing enough current. You should be able to have the alternator tested at a local auto parts retailer such as checker, Kragen or Auto Zone. If a diode is faulty those tests can certainly detect it.

2006-07-29 04:40:11
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Q: What would cause a battery to drain and not charge with the headlights on but charge up fine with the lights off?
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Related Questions

What will cause a ford f150 not to have any power no headlights no dash lights like i don't have no battery or either my starter is bad but its not what can cause this to happen?

If you have no battery then you have no power.

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Possible ground issue at the taillights.

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No, a starter cannot cause a battery to fail to charge. It could cause the battery to discharge quickly.

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The most common cause for your 1997 Honda Civic lights to dim is a bad alternator. The alternator is not charging the battery. The battery retains a small charge, but not enough charge to run the engine.

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Most likely a fuse.

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A dead cell in the battery or something is on, such as the headlights. A stuck relay will also cause this. More likely than not, the battery has a dead cell and needs replacing.

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A bad ground wire will cause dim headlights, or will cause lights not to work.

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if you leave any lights on in the car you may cause you a flat battery. if you leave any lights on in the car you may cause you a flat battery.

What would cause the engine to quit on a Ford F-150 when the headlights are turned on?

Perhaps the alternator is bad, and the lights bring the battery voltage down too far. You could also have a loose connection at the battery.

What will cause a battery to die over night?

A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Also if something is on drawing power from the battery it will run it down overnight. Look at all lights. Interior, under hood, trunk, give box, brake lights, etc. It can also be a stuck relay.

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If the engine isn't running, the battery is low. If the engine is running, the alternator probably has a problem. If you are wearing dark sunglasses, remove them and the lights will get brighter. good luck!

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Why do the dash radio and clock light dim when the head lights are turned on?

The headlights place a larger load on the battery and cause the voltage to drop enough to dim other devices slightly.

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probably the fuse is blown.

Can corrosion on battery cause lights to dim?


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the battery could have a dead cell, this could cause it to not charge. Have the battery tested to be sure.

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A bad battery or faulty battery connection.

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Dead cell in battery, replace it.

Why does your car not start with a jump?

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a weak battery would most likely be the problem. if that doesnt work, have your alternator checked.

Why would your 1999 Geo Tracker head lights and dash lights blink?

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