Yes.
Defective battery, loose or corroded wiring.
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Dead battery? Loose or corroded battery cable?
Yes. A loose negative battery cable can make a car hard to start. In fact it can make it impossible to start. If you don't have one you can go to a hardware or automobile supply store and purchase an adjustable wrench for a few dollars. With that wrench, you can tighten your cable. That wrench is useful for a number of things. While you are at it, also get a piece of sand paper and clean the battery terminal.
Make sure your Charge Alternator is working and charging your battery properly or else you will always have dead battery. Also avoid corrosion to build up in your battery poles. Make sure your battery poles are not loose and most of all always check water level of your battery.
MAKE SURE THE FAN BELT IS NOT LOOSE Rocky_B - See my entry here for more things you might want to check: http://wiki.answers.com/Q/What_could_be_wrong_if_the_battery_light_stays_on_and_the_battery_still_runs_down_on_a_1996_windstar_after_installing_a_new_battery_and_alternator
Your battery connection is bad or your battery power is very low. Make that the battery posts are clean and not loose.
A few causes that will make the Battery Light come on are: 1. Faulty Battery 2. Loose Battery Connection 3. Battery is not Charging, ie. Faulty Alternator
Weak battery, corroded or loose battery cables, failed starter.
You possibly have a loose alternator belt or the alternator is weak. Check the voltage at the battery with the engine running. It should be 13.5 ? 16 volts. Any less and the alternator is weak and needs replacing. Also make sure the connections at the battery are clean and tight.
Check ur battery cables they are grounded properly to battery posts, clea make sure when car is off your pulleys arent loose.
A low or dead battery. Loose or dirty battery cable connections. Faulty starter. Faulty starter solenoid.