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Q: I changed the alternator twice on my 99' ford explorer and it still won't start on 1999 Ford Explorer

I even jumped my car but as soon as I take the leads off it dies. Can someone please help me! Thank you for your time

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With out knowing which 4.0 it is...
1st turn the ignition switch to on position and make sure the charge light is on.
2nd make sure you have battery voltage to the large terminal at the back of the alt.
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